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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">COSMIC (Cohort Studies of Memory in an International Consortium): An international consortium to identify risk and protective factors and biomarkers of cognitive ageing and dementia in diverse ethnic and sociocultural groups</title>
<author><name sortKey="Sachdev, Perminder S" sort="Sachdev, Perminder S" uniqKey="Sachdev P" first="Perminder S" last="Sachdev">Perminder S. Sachdev</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I2">Dementia Collaborative Research Centre, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lipnicki, Darren M" sort="Lipnicki, Darren M" uniqKey="Lipnicki D" first="Darren M" last="Lipnicki">Darren M. Lipnicki</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Kochan, Nicole A" sort="Kochan, Nicole A" uniqKey="Kochan N" first="Nicole A" last="Kochan">Nicole A. Kochan</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Crawford, John D" sort="Crawford, John D" uniqKey="Crawford J" first="John D" last="Crawford">John D. Crawford</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Rockwood, Kenneth" sort="Rockwood, Kenneth" uniqKey="Rockwood K" first="Kenneth" last="Rockwood">Kenneth Rockwood</name>
<affiliation><nlm:aff id="I3">Department of Medicine (Geriatric Medicine & Neurology), Dalhousie University, Halifax, NS, Canada</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Xiao, Shifu" sort="Xiao, Shifu" uniqKey="Xiao S" first="Shifu" last="Xiao">Shifu Xiao</name>
<affiliation><nlm:aff id="I4">Department of Geriatric Psychiatry, Shanghai Mental Health Center, Shanghai Jiaotong University School of Medicine, Shanghai, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Li, Juan" sort="Li, Juan" uniqKey="Li J" first="Juan" last="Li">Juan Li</name>
<affiliation><nlm:aff id="I5">Institute of Psychology, Chinese Academy of Sciences, Beijing, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Li, Xia" sort="Li, Xia" uniqKey="Li X" first="Xia" last="Li">Xia Li</name>
<affiliation><nlm:aff id="I4">Department of Geriatric Psychiatry, Shanghai Mental Health Center, Shanghai Jiaotong University School of Medicine, Shanghai, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Brayne, Carol" sort="Brayne, Carol" uniqKey="Brayne C" first="Carol" last="Brayne">Carol Brayne</name>
<affiliation><nlm:aff id="I6">Department of Public Health and Primary Care, Cambridge University, Cambridge, UK</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Matthews, Fiona E" sort="Matthews, Fiona E" uniqKey="Matthews F" first="Fiona E" last="Matthews">Fiona E. Matthews</name>
<affiliation><nlm:aff id="I7">MRC Biostatistics Unit, Institute of Public Health, Cambridge, UK</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Stephan, Blossom Cm" sort="Stephan, Blossom Cm" uniqKey="Stephan B" first="Blossom Cm" last="Stephan">Blossom Cm Stephan</name>
<affiliation><nlm:aff id="I8">Institute of Health and Society, Newcastle University, Newcastle upon Tyne, UK</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lipton, Richard B" sort="Lipton, Richard B" uniqKey="Lipton R" first="Richard B" last="Lipton">Richard B. Lipton</name>
<affiliation><nlm:aff id="I9">Saul B. Korey Department of Neurology; Albert Einstein College of Medicine, Yeshiva University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I10">Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Yeshiva University, New York, NY, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Katz, Mindy J" sort="Katz, Mindy J" uniqKey="Katz M" first="Mindy J" last="Katz">Mindy J. Katz</name>
<affiliation><nlm:aff id="I9">Saul B. Korey Department of Neurology; Albert Einstein College of Medicine, Yeshiva University, New York, NY, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ritchie, Karen" sort="Ritchie, Karen" uniqKey="Ritchie K" first="Karen" last="Ritchie">Karen Ritchie</name>
<affiliation><nlm:aff id="I11">Inserm, U1061 Nervous System Pathologies: Epidemiological and Clinical Research, La Colombière Hospital, Montpellier Cedex 5, France</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I12">Université de Montpellier 1, Montpellier, France</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I13">Faculty of Medicine, Imperial College, St Mary’s Hospital, London, UK</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Carriere, Isabelle" sort="Carriere, Isabelle" uniqKey="Carriere I" first="Isabelle" last="Carrière">Isabelle Carrière</name>
<affiliation><nlm:aff id="I11">Inserm, U1061 Nervous System Pathologies: Epidemiological and Clinical Research, La Colombière Hospital, Montpellier Cedex 5, France</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I12">Université de Montpellier 1, Montpellier, France</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ancelin, Marie Laure" sort="Ancelin, Marie Laure" uniqKey="Ancelin M" first="Marie-Laure" last="Ancelin">Marie-Laure Ancelin</name>
<affiliation><nlm:aff id="I11">Inserm, U1061 Nervous System Pathologies: Epidemiological and Clinical Research, La Colombière Hospital, Montpellier Cedex 5, France</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I12">Université de Montpellier 1, Montpellier, France</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Seshadri, Sudha" sort="Seshadri, Sudha" uniqKey="Seshadri S" first="Sudha" last="Seshadri">Sudha Seshadri</name>
<affiliation><nlm:aff id="I14">Department of Neurology, Boston University School of Medicine, Boston, MA, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Au, Rhoda" sort="Au, Rhoda" uniqKey="Au R" first="Rhoda" last="Au">Rhoda Au</name>
<affiliation><nlm:aff id="I14">Department of Neurology, Boston University School of Medicine, Boston, MA, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Beiser, Alexa S" sort="Beiser, Alexa S" uniqKey="Beiser A" first="Alexa S" last="Beiser">Alexa S. Beiser</name>
<affiliation><nlm:aff id="I15">Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lam, Linda Cw" sort="Lam, Linda Cw" uniqKey="Lam L" first="Linda Cw" last="Lam">Linda Cw Lam</name>
<affiliation><nlm:aff id="I16">Department of Psychiatry, The Chinese University of Hong Kong, Hong Kong, SAR, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Wong, Candy Hy" sort="Wong, Candy Hy" uniqKey="Wong C" first="Candy Hy" last="Wong">Candy Hy Wong</name>
<affiliation><nlm:aff id="I17">Department of Psychiatry, Tai Po Hospital, Hong Kong, SAR, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Fung, Ada Wt" sort="Fung, Ada Wt" uniqKey="Fung A" first="Ada Wt" last="Fung">Ada Wt Fung</name>
<affiliation><nlm:aff id="I16">Department of Psychiatry, The Chinese University of Hong Kong, Hong Kong, SAR, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Kim, Ki Woong" sort="Kim, Ki Woong" uniqKey="Kim K" first="Ki Woong" last="Kim">Ki Woong Kim</name>
<affiliation><nlm:aff id="I18">Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I19">Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I20">Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Han, Ji Won" sort="Han, Ji Won" uniqKey="Han J" first="Ji Won" last="Han">Ji Won Han</name>
<affiliation><nlm:aff id="I18">Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Kim, Tae Hui" sort="Kim, Tae Hui" uniqKey="Kim T" first="Tae Hui" last="Kim">Tae Hui Kim</name>
<affiliation><nlm:aff id="I18">Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Petersen, Ronald C" sort="Petersen, Ronald C" uniqKey="Petersen R" first="Ronald C" last="Petersen">Ronald C. Petersen</name>
<affiliation><nlm:aff id="I21">Mayo Clinic College of Medicine, Rochester, MN, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Roberts, Rosebud O" sort="Roberts, Rosebud O" uniqKey="Roberts R" first="Rosebud O" last="Roberts">Rosebud O. Roberts</name>
<affiliation><nlm:aff id="I21">Mayo Clinic College of Medicine, Rochester, MN, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Mielke, Michelle M" sort="Mielke, Michelle M" uniqKey="Mielke M" first="Michelle M" last="Mielke">Michelle M. Mielke</name>
<affiliation><nlm:aff id="I21">Mayo Clinic College of Medicine, Rochester, MN, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ganguli, Mary" sort="Ganguli, Mary" uniqKey="Ganguli M" first="Mary" last="Ganguli">Mary Ganguli</name>
<affiliation><nlm:aff id="I22">Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I23">Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I24">Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Dodge, Hiroko H" sort="Dodge, Hiroko H" uniqKey="Dodge H" first="Hiroko H" last="Dodge">Hiroko H. Dodge</name>
<affiliation><nlm:aff id="I25">Department of Neurology, Oregon Health and Science University, Portland, OR, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I26">Department of Neurology, University of Michigan, Ann Arbor, MI, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Hughes, Tiffany" sort="Hughes, Tiffany" uniqKey="Hughes T" first="Tiffany" last="Hughes">Tiffany Hughes</name>
<affiliation><nlm:aff id="I22">Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Anstey, Kaarin J" sort="Anstey, Kaarin J" uniqKey="Anstey K" first="Kaarin J" last="Anstey">Kaarin J. Anstey</name>
<affiliation><nlm:aff id="I27">Centre for Research on Ageing, Health and Wellbeing, College of Medicine, Biology and Environment, The Australian National University, Canberra, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Cherbuin, Nicolas" sort="Cherbuin, Nicolas" uniqKey="Cherbuin N" first="Nicolas" last="Cherbuin">Nicolas Cherbuin</name>
<affiliation><nlm:aff id="I27">Centre for Research on Ageing, Health and Wellbeing, College of Medicine, Biology and Environment, The Australian National University, Canberra, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Butterworth, Peter" sort="Butterworth, Peter" uniqKey="Butterworth P" first="Peter" last="Butterworth">Peter Butterworth</name>
<affiliation><nlm:aff id="I27">Centre for Research on Ageing, Health and Wellbeing, College of Medicine, Biology and Environment, The Australian National University, Canberra, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ng, Tze Pin" sort="Ng, Tze Pin" uniqKey="Ng T" first="Tze Pin" last="Ng">Tze Pin Ng</name>
<affiliation><nlm:aff id="I28">Gerontology Research Programme, Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Gao, Qi" sort="Gao, Qi" uniqKey="Gao Q" first="Qi" last="Gao">Qi Gao</name>
<affiliation><nlm:aff id="I28">Gerontology Research Programme, Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Reppermund, Simone" sort="Reppermund, Simone" uniqKey="Reppermund S" first="Simone" last="Reppermund">Simone Reppermund</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Brodaty, Henry" sort="Brodaty, Henry" uniqKey="Brodaty H" first="Henry" last="Brodaty">Henry Brodaty</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I2">Dementia Collaborative Research Centre, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Meguro, Kenichi" sort="Meguro, Kenichi" uniqKey="Meguro K" first="Kenichi" last="Meguro">Kenichi Meguro</name>
<affiliation><nlm:aff id="I29">Department of Geriatric Behavioral Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Schupf, Nicole" sort="Schupf, Nicole" uniqKey="Schupf N" first="Nicole" last="Schupf">Nicole Schupf</name>
<affiliation><nlm:aff id="I30">The Taub Institute for Research in Alzheimer’s Disease and the Aging Brain, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I31">The Gertrude H. Sergievsky Center, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I32">The Division of Epidemiology, Joseph P. Mailman School of Public Health, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Manly, Jennifer" sort="Manly, Jennifer" uniqKey="Manly J" first="Jennifer" last="Manly">Jennifer Manly</name>
<affiliation><nlm:aff id="I30">The Taub Institute for Research in Alzheimer’s Disease and the Aging Brain, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I31">The Gertrude H. Sergievsky Center, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I33">The Department of Neurology, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Stern, Yaakov" sort="Stern, Yaakov" uniqKey="Stern Y" first="Yaakov" last="Stern">Yaakov Stern</name>
<affiliation><nlm:aff id="I30">The Taub Institute for Research in Alzheimer’s Disease and the Aging Brain, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I31">The Gertrude H. Sergievsky Center, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I33">The Department of Neurology, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lobo, Antonio" sort="Lobo, Antonio" uniqKey="Lobo A" first="Antonio" last="Lobo">Antonio Lobo</name>
<affiliation><nlm:aff id="I34">Department of Medicine and Psychiatry, Universidad de Zaragoza, Zaragoza, Spain</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I35">Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Ministry of Science and Innovation, Madrid, Spain</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I36">Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Zaragoza, Spain</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lopez Anton, Raul" sort="Lopez Anton, Raul" uniqKey="Lopez Anton R" first="Raúl" last="Lopez-Anton">Raúl Lopez-Anton</name>
<affiliation><nlm:aff id="I35">Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Ministry of Science and Innovation, Madrid, Spain</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I37">Department of Psychology and Sociology, Universidad de Zaragoza, Zaragoza, Spain</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Santabarbara, Javier" sort="Santabarbara, Javier" uniqKey="Santabarbara J" first="Javier" last="Santabárbara">Javier Santabárbara</name>
<affiliation><nlm:aff id="I35">Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Ministry of Science and Innovation, Madrid, Spain</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I38">Department of Preventive Medicine and Public Health, Universidad de Zaragoza, Zaragoza, Spain</nlm:aff>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">24195705</idno>
<idno type="pmc">3827845</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3827845</idno>
<idno type="RBID">PMC:3827845</idno>
<idno type="doi">10.1186/1471-2377-13-165</idno>
<date when="2013">2013</date>
<idno type="wicri:Area/Pmc/Corpus">001605</idno>
<idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001605</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">COSMIC (Cohort Studies of Memory in an International Consortium): An international consortium to identify risk and protective factors and biomarkers of cognitive ageing and dementia in diverse ethnic and sociocultural groups</title>
<author><name sortKey="Sachdev, Perminder S" sort="Sachdev, Perminder S" uniqKey="Sachdev P" first="Perminder S" last="Sachdev">Perminder S. Sachdev</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I2">Dementia Collaborative Research Centre, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lipnicki, Darren M" sort="Lipnicki, Darren M" uniqKey="Lipnicki D" first="Darren M" last="Lipnicki">Darren M. Lipnicki</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Kochan, Nicole A" sort="Kochan, Nicole A" uniqKey="Kochan N" first="Nicole A" last="Kochan">Nicole A. Kochan</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Crawford, John D" sort="Crawford, John D" uniqKey="Crawford J" first="John D" last="Crawford">John D. Crawford</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Rockwood, Kenneth" sort="Rockwood, Kenneth" uniqKey="Rockwood K" first="Kenneth" last="Rockwood">Kenneth Rockwood</name>
<affiliation><nlm:aff id="I3">Department of Medicine (Geriatric Medicine & Neurology), Dalhousie University, Halifax, NS, Canada</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Xiao, Shifu" sort="Xiao, Shifu" uniqKey="Xiao S" first="Shifu" last="Xiao">Shifu Xiao</name>
<affiliation><nlm:aff id="I4">Department of Geriatric Psychiatry, Shanghai Mental Health Center, Shanghai Jiaotong University School of Medicine, Shanghai, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Li, Juan" sort="Li, Juan" uniqKey="Li J" first="Juan" last="Li">Juan Li</name>
<affiliation><nlm:aff id="I5">Institute of Psychology, Chinese Academy of Sciences, Beijing, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Li, Xia" sort="Li, Xia" uniqKey="Li X" first="Xia" last="Li">Xia Li</name>
<affiliation><nlm:aff id="I4">Department of Geriatric Psychiatry, Shanghai Mental Health Center, Shanghai Jiaotong University School of Medicine, Shanghai, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Brayne, Carol" sort="Brayne, Carol" uniqKey="Brayne C" first="Carol" last="Brayne">Carol Brayne</name>
<affiliation><nlm:aff id="I6">Department of Public Health and Primary Care, Cambridge University, Cambridge, UK</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Matthews, Fiona E" sort="Matthews, Fiona E" uniqKey="Matthews F" first="Fiona E" last="Matthews">Fiona E. Matthews</name>
<affiliation><nlm:aff id="I7">MRC Biostatistics Unit, Institute of Public Health, Cambridge, UK</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Stephan, Blossom Cm" sort="Stephan, Blossom Cm" uniqKey="Stephan B" first="Blossom Cm" last="Stephan">Blossom Cm Stephan</name>
<affiliation><nlm:aff id="I8">Institute of Health and Society, Newcastle University, Newcastle upon Tyne, UK</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lipton, Richard B" sort="Lipton, Richard B" uniqKey="Lipton R" first="Richard B" last="Lipton">Richard B. Lipton</name>
<affiliation><nlm:aff id="I9">Saul B. Korey Department of Neurology; Albert Einstein College of Medicine, Yeshiva University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I10">Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Yeshiva University, New York, NY, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Katz, Mindy J" sort="Katz, Mindy J" uniqKey="Katz M" first="Mindy J" last="Katz">Mindy J. Katz</name>
<affiliation><nlm:aff id="I9">Saul B. Korey Department of Neurology; Albert Einstein College of Medicine, Yeshiva University, New York, NY, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ritchie, Karen" sort="Ritchie, Karen" uniqKey="Ritchie K" first="Karen" last="Ritchie">Karen Ritchie</name>
<affiliation><nlm:aff id="I11">Inserm, U1061 Nervous System Pathologies: Epidemiological and Clinical Research, La Colombière Hospital, Montpellier Cedex 5, France</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I12">Université de Montpellier 1, Montpellier, France</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I13">Faculty of Medicine, Imperial College, St Mary’s Hospital, London, UK</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Carriere, Isabelle" sort="Carriere, Isabelle" uniqKey="Carriere I" first="Isabelle" last="Carrière">Isabelle Carrière</name>
<affiliation><nlm:aff id="I11">Inserm, U1061 Nervous System Pathologies: Epidemiological and Clinical Research, La Colombière Hospital, Montpellier Cedex 5, France</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I12">Université de Montpellier 1, Montpellier, France</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ancelin, Marie Laure" sort="Ancelin, Marie Laure" uniqKey="Ancelin M" first="Marie-Laure" last="Ancelin">Marie-Laure Ancelin</name>
<affiliation><nlm:aff id="I11">Inserm, U1061 Nervous System Pathologies: Epidemiological and Clinical Research, La Colombière Hospital, Montpellier Cedex 5, France</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I12">Université de Montpellier 1, Montpellier, France</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Seshadri, Sudha" sort="Seshadri, Sudha" uniqKey="Seshadri S" first="Sudha" last="Seshadri">Sudha Seshadri</name>
<affiliation><nlm:aff id="I14">Department of Neurology, Boston University School of Medicine, Boston, MA, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Au, Rhoda" sort="Au, Rhoda" uniqKey="Au R" first="Rhoda" last="Au">Rhoda Au</name>
<affiliation><nlm:aff id="I14">Department of Neurology, Boston University School of Medicine, Boston, MA, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Beiser, Alexa S" sort="Beiser, Alexa S" uniqKey="Beiser A" first="Alexa S" last="Beiser">Alexa S. Beiser</name>
<affiliation><nlm:aff id="I15">Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA</nlm:aff>
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</author>
<author><name sortKey="Lam, Linda Cw" sort="Lam, Linda Cw" uniqKey="Lam L" first="Linda Cw" last="Lam">Linda Cw Lam</name>
<affiliation><nlm:aff id="I16">Department of Psychiatry, The Chinese University of Hong Kong, Hong Kong, SAR, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Wong, Candy Hy" sort="Wong, Candy Hy" uniqKey="Wong C" first="Candy Hy" last="Wong">Candy Hy Wong</name>
<affiliation><nlm:aff id="I17">Department of Psychiatry, Tai Po Hospital, Hong Kong, SAR, China</nlm:aff>
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</author>
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<affiliation><nlm:aff id="I16">Department of Psychiatry, The Chinese University of Hong Kong, Hong Kong, SAR, China</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Kim, Ki Woong" sort="Kim, Ki Woong" uniqKey="Kim K" first="Ki Woong" last="Kim">Ki Woong Kim</name>
<affiliation><nlm:aff id="I18">Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I19">Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I20">Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Han, Ji Won" sort="Han, Ji Won" uniqKey="Han J" first="Ji Won" last="Han">Ji Won Han</name>
<affiliation><nlm:aff id="I18">Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Kim, Tae Hui" sort="Kim, Tae Hui" uniqKey="Kim T" first="Tae Hui" last="Kim">Tae Hui Kim</name>
<affiliation><nlm:aff id="I18">Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Petersen, Ronald C" sort="Petersen, Ronald C" uniqKey="Petersen R" first="Ronald C" last="Petersen">Ronald C. Petersen</name>
<affiliation><nlm:aff id="I21">Mayo Clinic College of Medicine, Rochester, MN, USA</nlm:aff>
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</author>
<author><name sortKey="Roberts, Rosebud O" sort="Roberts, Rosebud O" uniqKey="Roberts R" first="Rosebud O" last="Roberts">Rosebud O. Roberts</name>
<affiliation><nlm:aff id="I21">Mayo Clinic College of Medicine, Rochester, MN, USA</nlm:aff>
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</author>
<author><name sortKey="Mielke, Michelle M" sort="Mielke, Michelle M" uniqKey="Mielke M" first="Michelle M" last="Mielke">Michelle M. Mielke</name>
<affiliation><nlm:aff id="I21">Mayo Clinic College of Medicine, Rochester, MN, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ganguli, Mary" sort="Ganguli, Mary" uniqKey="Ganguli M" first="Mary" last="Ganguli">Mary Ganguli</name>
<affiliation><nlm:aff id="I22">Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I23">Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I24">Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA, USA</nlm:aff>
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</author>
<author><name sortKey="Dodge, Hiroko H" sort="Dodge, Hiroko H" uniqKey="Dodge H" first="Hiroko H" last="Dodge">Hiroko H. Dodge</name>
<affiliation><nlm:aff id="I25">Department of Neurology, Oregon Health and Science University, Portland, OR, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I26">Department of Neurology, University of Michigan, Ann Arbor, MI, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Hughes, Tiffany" sort="Hughes, Tiffany" uniqKey="Hughes T" first="Tiffany" last="Hughes">Tiffany Hughes</name>
<affiliation><nlm:aff id="I22">Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Anstey, Kaarin J" sort="Anstey, Kaarin J" uniqKey="Anstey K" first="Kaarin J" last="Anstey">Kaarin J. Anstey</name>
<affiliation><nlm:aff id="I27">Centre for Research on Ageing, Health and Wellbeing, College of Medicine, Biology and Environment, The Australian National University, Canberra, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Cherbuin, Nicolas" sort="Cherbuin, Nicolas" uniqKey="Cherbuin N" first="Nicolas" last="Cherbuin">Nicolas Cherbuin</name>
<affiliation><nlm:aff id="I27">Centre for Research on Ageing, Health and Wellbeing, College of Medicine, Biology and Environment, The Australian National University, Canberra, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Butterworth, Peter" sort="Butterworth, Peter" uniqKey="Butterworth P" first="Peter" last="Butterworth">Peter Butterworth</name>
<affiliation><nlm:aff id="I27">Centre for Research on Ageing, Health and Wellbeing, College of Medicine, Biology and Environment, The Australian National University, Canberra, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ng, Tze Pin" sort="Ng, Tze Pin" uniqKey="Ng T" first="Tze Pin" last="Ng">Tze Pin Ng</name>
<affiliation><nlm:aff id="I28">Gerontology Research Programme, Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore</nlm:aff>
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<author><name sortKey="Gao, Qi" sort="Gao, Qi" uniqKey="Gao Q" first="Qi" last="Gao">Qi Gao</name>
<affiliation><nlm:aff id="I28">Gerontology Research Programme, Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore</nlm:aff>
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<author><name sortKey="Reppermund, Simone" sort="Reppermund, Simone" uniqKey="Reppermund S" first="Simone" last="Reppermund">Simone Reppermund</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Brodaty, Henry" sort="Brodaty, Henry" uniqKey="Brodaty H" first="Henry" last="Brodaty">Henry Brodaty</name>
<affiliation><nlm:aff id="I1">Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I2">Dementia Collaborative Research Centre, University of New South Wales, Sydney, Australia</nlm:aff>
</affiliation>
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<author><name sortKey="Meguro, Kenichi" sort="Meguro, Kenichi" uniqKey="Meguro K" first="Kenichi" last="Meguro">Kenichi Meguro</name>
<affiliation><nlm:aff id="I29">Department of Geriatric Behavioral Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Schupf, Nicole" sort="Schupf, Nicole" uniqKey="Schupf N" first="Nicole" last="Schupf">Nicole Schupf</name>
<affiliation><nlm:aff id="I30">The Taub Institute for Research in Alzheimer’s Disease and the Aging Brain, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I31">The Gertrude H. Sergievsky Center, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I32">The Division of Epidemiology, Joseph P. Mailman School of Public Health, Columbia University, New York, NY, USA</nlm:aff>
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</author>
<author><name sortKey="Manly, Jennifer" sort="Manly, Jennifer" uniqKey="Manly J" first="Jennifer" last="Manly">Jennifer Manly</name>
<affiliation><nlm:aff id="I30">The Taub Institute for Research in Alzheimer’s Disease and the Aging Brain, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I31">The Gertrude H. Sergievsky Center, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I33">The Department of Neurology, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Stern, Yaakov" sort="Stern, Yaakov" uniqKey="Stern Y" first="Yaakov" last="Stern">Yaakov Stern</name>
<affiliation><nlm:aff id="I30">The Taub Institute for Research in Alzheimer’s Disease and the Aging Brain, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I31">The Gertrude H. Sergievsky Center, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I33">The Department of Neurology, Columbia University, New York, NY, USA</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lobo, Antonio" sort="Lobo, Antonio" uniqKey="Lobo A" first="Antonio" last="Lobo">Antonio Lobo</name>
<affiliation><nlm:aff id="I34">Department of Medicine and Psychiatry, Universidad de Zaragoza, Zaragoza, Spain</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I35">Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Ministry of Science and Innovation, Madrid, Spain</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I36">Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Zaragoza, Spain</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lopez Anton, Raul" sort="Lopez Anton, Raul" uniqKey="Lopez Anton R" first="Raúl" last="Lopez-Anton">Raúl Lopez-Anton</name>
<affiliation><nlm:aff id="I35">Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Ministry of Science and Innovation, Madrid, Spain</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I37">Department of Psychology and Sociology, Universidad de Zaragoza, Zaragoza, Spain</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Santabarbara, Javier" sort="Santabarbara, Javier" uniqKey="Santabarbara J" first="Javier" last="Santabárbara">Javier Santabárbara</name>
<affiliation><nlm:aff id="I35">Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Ministry of Science and Innovation, Madrid, Spain</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="I38">Department of Preventive Medicine and Public Health, Universidad de Zaragoza, Zaragoza, Spain</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">BMC Neurology</title>
<idno type="eISSN">1471-2377</idno>
<imprint><date when="2013">2013</date>
</imprint>
</series>
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</sourceDesc>
</fileDesc>
<profileDesc><textClass></textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en"><sec><title>Background</title>
<p>A large number of longitudinal studies of population-based ageing cohorts are in progress internationally, but the insights from these studies into the risk and protective factors for cognitive ageing and conditions like mild cognitive impairment and dementia have been inconsistent. Some of the problems confounding this research can be reduced by harmonising and pooling data across studies. COSMIC (Cohort Studies of Memory in an International Consortium) aims to harmonise data from international cohort studies of cognitive ageing, in order to better understand the determinants of cognitive ageing and neurocognitive disorders.</p>
</sec>
<sec><title>Methods/Design</title>
<p>Longitudinal studies of cognitive ageing and dementia with at least 500 individuals aged 60 years or over are eligible and invited to be members of COSMIC. There are currently 17 member studies, from regions that include Asia, Australia, Europe, and North America. A Research Steering Committee has been established, two meetings of study leaders held, and a website developed. The initial attempts at harmonising key variables like neuropsychological test scores are in progress.</p>
</sec>
<sec><title>Discussion</title>
<p>The challenges of international consortia like COSMIC include efficient communication among members, extended use of resources, and data harmonisation. Successful harmonisation will facilitate projects investigating rates of cognitive decline, risk and protective factors for mild cognitive impairment, and biomarkers of mild cognitive impairment and dementia. Extended implications of COSMIC could include standardised ways of collecting and reporting data, and a rich cognitive ageing database being made available to other researchers. COSMIC could potentially transform our understanding of the epidemiology of cognitive ageing, and have a world-wide impact on promoting successful ageing.</p>
</sec>
</div>
</front>
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<journal-id journal-id-type="iso-abbrev">BMC Neurol</journal-id>
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<article-id pub-id-type="doi">10.1186/1471-2377-13-165</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Study Protocol</subject>
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<email>Kaarin.Anstey@anu.edu.au</email>
</contrib>
<contrib contrib-type="author" id="A33"><name><surname>Cherbuin</surname>
<given-names>Nicolas</given-names>
</name>
<xref ref-type="aff" rid="I27">27</xref>
<email>nicolas.cherbuin@anu.edu.au</email>
</contrib>
<contrib contrib-type="author" id="A34"><name><surname>Butterworth</surname>
<given-names>Peter</given-names>
</name>
<xref ref-type="aff" rid="I27">27</xref>
<email>peter.butterworth@anu.edu.au</email>
</contrib>
<contrib contrib-type="author" id="A35"><name><surname>Ng</surname>
<given-names>Tze Pin</given-names>
</name>
<xref ref-type="aff" rid="I28">28</xref>
<email>tze_pin_ng@nuhs.edu.sg</email>
</contrib>
<contrib contrib-type="author" id="A36"><name><surname>Gao</surname>
<given-names>Qi</given-names>
</name>
<xref ref-type="aff" rid="I28">28</xref>
<email>pcmgqi@nus.edu.sg</email>
</contrib>
<contrib contrib-type="author" id="A37"><name><surname>Reppermund</surname>
<given-names>Simone</given-names>
</name>
<xref ref-type="aff" rid="I1">1</xref>
<email>s.reppermund@unsw.edu.au</email>
</contrib>
<contrib contrib-type="author" id="A38"><name><surname>Brodaty</surname>
<given-names>Henry</given-names>
</name>
<xref ref-type="aff" rid="I1">1</xref>
<xref ref-type="aff" rid="I2">2</xref>
<email>h.brodaty@unsw.edu.au</email>
</contrib>
<contrib contrib-type="author" id="A39"><name><surname>Meguro</surname>
<given-names>Kenichi</given-names>
</name>
<xref ref-type="aff" rid="I29">29</xref>
<email>k-meg@umin.ac.jp</email>
</contrib>
<contrib contrib-type="author" id="A40"><name><surname>Schupf</surname>
<given-names>Nicole</given-names>
</name>
<xref ref-type="aff" rid="I30">30</xref>
<xref ref-type="aff" rid="I31">31</xref>
<xref ref-type="aff" rid="I32">32</xref>
<email>ns24@columbia.edu</email>
</contrib>
<contrib contrib-type="author" id="A41"><name><surname>Manly</surname>
<given-names>Jennifer</given-names>
</name>
<xref ref-type="aff" rid="I30">30</xref>
<xref ref-type="aff" rid="I31">31</xref>
<xref ref-type="aff" rid="I33">33</xref>
<email>jennifer.manly@gmail.com</email>
</contrib>
<contrib contrib-type="author" id="A42"><name><surname>Stern</surname>
<given-names>Yaakov</given-names>
</name>
<xref ref-type="aff" rid="I30">30</xref>
<xref ref-type="aff" rid="I31">31</xref>
<xref ref-type="aff" rid="I33">33</xref>
<email>ys11@columbia.edu</email>
</contrib>
<contrib contrib-type="author" id="A43"><name><surname>Lobo</surname>
<given-names>Antonio</given-names>
</name>
<xref ref-type="aff" rid="I34">34</xref>
<xref ref-type="aff" rid="I35">35</xref>
<xref ref-type="aff" rid="I36">36</xref>
<email>alobo@unizar.es</email>
</contrib>
<contrib contrib-type="author" id="A44"><name><surname>Lopez-Anton</surname>
<given-names>Raúl</given-names>
</name>
<xref ref-type="aff" rid="I35">35</xref>
<xref ref-type="aff" rid="I37">37</xref>
<email>rlanton@unizar.es</email>
</contrib>
<contrib contrib-type="author" id="A45"><name><surname>Santabárbara</surname>
<given-names>Javier</given-names>
</name>
<xref ref-type="aff" rid="I35">35</xref>
<xref ref-type="aff" rid="I38">38</xref>
<email>jsantabarbara@unizar.es</email>
</contrib>
<on-behalf-of>COSMIC<xref ref-type="corresp" rid="d33e442"></xref>
</on-behalf-of>
</contrib-group>
<aff id="I1"><label>1</label>
Centre for Healthy Brain Ageing, University of New South Wales, Sydney, Australia</aff>
<aff id="I2"><label>2</label>
Dementia Collaborative Research Centre, University of New South Wales, Sydney, Australia</aff>
<aff id="I3"><label>3</label>
Department of Medicine (Geriatric Medicine & Neurology), Dalhousie University, Halifax, NS, Canada</aff>
<aff id="I4"><label>4</label>
Department of Geriatric Psychiatry, Shanghai Mental Health Center, Shanghai Jiaotong University School of Medicine, Shanghai, China</aff>
<aff id="I5"><label>5</label>
Institute of Psychology, Chinese Academy of Sciences, Beijing, China</aff>
<aff id="I6"><label>6</label>
Department of Public Health and Primary Care, Cambridge University, Cambridge, UK</aff>
<aff id="I7"><label>7</label>
MRC Biostatistics Unit, Institute of Public Health, Cambridge, UK</aff>
<aff id="I8"><label>8</label>
Institute of Health and Society, Newcastle University, Newcastle upon Tyne, UK</aff>
<aff id="I9"><label>9</label>
Saul B. Korey Department of Neurology; Albert Einstein College of Medicine, Yeshiva University, New York, NY, USA</aff>
<aff id="I10"><label>10</label>
Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Yeshiva University, New York, NY, USA</aff>
<aff id="I11"><label>11</label>
Inserm, U1061 Nervous System Pathologies: Epidemiological and Clinical Research, La Colombière Hospital, Montpellier Cedex 5, France</aff>
<aff id="I12"><label>12</label>
Université de Montpellier 1, Montpellier, France</aff>
<aff id="I13"><label>13</label>
Faculty of Medicine, Imperial College, St Mary’s Hospital, London, UK</aff>
<aff id="I14"><label>14</label>
Department of Neurology, Boston University School of Medicine, Boston, MA, USA</aff>
<aff id="I15"><label>15</label>
Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA</aff>
<aff id="I16"><label>16</label>
Department of Psychiatry, The Chinese University of Hong Kong, Hong Kong, SAR, China</aff>
<aff id="I17"><label>17</label>
Department of Psychiatry, Tai Po Hospital, Hong Kong, SAR, China</aff>
<aff id="I18"><label>18</label>
Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Korea</aff>
<aff id="I19"><label>19</label>
Department of Psychiatry, Seoul National University College of Medicine, Seoul, Korea</aff>
<aff id="I20"><label>20</label>
Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Korea</aff>
<aff id="I21"><label>21</label>
Mayo Clinic College of Medicine, Rochester, MN, USA</aff>
<aff id="I22"><label>22</label>
Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA</aff>
<aff id="I23"><label>23</label>
Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA</aff>
<aff id="I24"><label>24</label>
Department of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA, USA</aff>
<aff id="I25"><label>25</label>
Department of Neurology, Oregon Health and Science University, Portland, OR, USA</aff>
<aff id="I26"><label>26</label>
Department of Neurology, University of Michigan, Ann Arbor, MI, USA</aff>
<aff id="I27"><label>27</label>
Centre for Research on Ageing, Health and Wellbeing, College of Medicine, Biology and Environment, The Australian National University, Canberra, Australia</aff>
<aff id="I28"><label>28</label>
Gerontology Research Programme, Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore</aff>
<aff id="I29"><label>29</label>
Department of Geriatric Behavioral Neurology, Tohoku University Graduate School of Medicine, Sendai, Japan</aff>
<aff id="I30"><label>30</label>
The Taub Institute for Research in Alzheimer’s Disease and the Aging Brain, Columbia University, New York, NY, USA</aff>
<aff id="I31"><label>31</label>
The Gertrude H. Sergievsky Center, Columbia University, New York, NY, USA</aff>
<aff id="I32"><label>32</label>
The Division of Epidemiology, Joseph P. Mailman School of Public Health, Columbia University, New York, NY, USA</aff>
<aff id="I33"><label>33</label>
The Department of Neurology, Columbia University, New York, NY, USA</aff>
<aff id="I34"><label>34</label>
Department of Medicine and Psychiatry, Universidad de Zaragoza, Zaragoza, Spain</aff>
<aff id="I35"><label>35</label>
Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Ministry of Science and Innovation, Madrid, Spain</aff>
<aff id="I36"><label>36</label>
Instituto de Investigación Sanitaria de Aragón (IIS Aragón), Zaragoza, Spain</aff>
<aff id="I37"><label>37</label>
Department of Psychology and Sociology, Universidad de Zaragoza, Zaragoza, Spain</aff>
<aff id="I38"><label>38</label>
Department of Preventive Medicine and Public Health, Universidad de Zaragoza, Zaragoza, Spain</aff>
<author-notes><corresp id="d33e442">COSMIC</corresp>
</author-notes>
<pub-date pub-type="collection"><year>2013</year>
</pub-date>
<pub-date pub-type="epub"><day>6</day>
<month>11</month>
<year>2013</year>
</pub-date>
<volume>13</volume>
<fpage>165</fpage>
<lpage>165</lpage>
<history><date date-type="received"><day>10</day>
<month>10</month>
<year>2013</year>
</date>
<date date-type="accepted"><day>31</day>
<month>10</month>
<year>2013</year>
</date>
</history>
<permissions><copyright-statement>Copyright © 2013 Sachdev et al.; licensee BioMed Central Ltd.</copyright-statement>
<copyright-year>2013</copyright-year>
<copyright-holder>Sachdev et al.; licensee BioMed Central Ltd.</copyright-holder>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/2.0"><license-p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/2.0">http://creativecommons.org/licenses/by/2.0</ext-link>
), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/publicdomain/zero/1.0/">http://creativecommons.org/publicdomain/zero/1.0/</ext-link>
) applies to the data made available in this article, unless otherwise stated.</license-p>
</license>
</permissions>
<self-uri xlink:href="http://www.biomedcentral.com/1471-2377/13/165"></self-uri>
<abstract><sec><title>Background</title>
<p>A large number of longitudinal studies of population-based ageing cohorts are in progress internationally, but the insights from these studies into the risk and protective factors for cognitive ageing and conditions like mild cognitive impairment and dementia have been inconsistent. Some of the problems confounding this research can be reduced by harmonising and pooling data across studies. COSMIC (Cohort Studies of Memory in an International Consortium) aims to harmonise data from international cohort studies of cognitive ageing, in order to better understand the determinants of cognitive ageing and neurocognitive disorders.</p>
</sec>
<sec><title>Methods/Design</title>
<p>Longitudinal studies of cognitive ageing and dementia with at least 500 individuals aged 60 years or over are eligible and invited to be members of COSMIC. There are currently 17 member studies, from regions that include Asia, Australia, Europe, and North America. A Research Steering Committee has been established, two meetings of study leaders held, and a website developed. The initial attempts at harmonising key variables like neuropsychological test scores are in progress.</p>
</sec>
<sec><title>Discussion</title>
<p>The challenges of international consortia like COSMIC include efficient communication among members, extended use of resources, and data harmonisation. Successful harmonisation will facilitate projects investigating rates of cognitive decline, risk and protective factors for mild cognitive impairment, and biomarkers of mild cognitive impairment and dementia. Extended implications of COSMIC could include standardised ways of collecting and reporting data, and a rich cognitive ageing database being made available to other researchers. COSMIC could potentially transform our understanding of the epidemiology of cognitive ageing, and have a world-wide impact on promoting successful ageing.</p>
</sec>
</abstract>
<kwd-group><kwd>Cohort studies</kwd>
<kwd>Cognitive ageing</kwd>
<kwd>Data harmonisation</kwd>
<kwd>Dementia</kwd>
<kwd>International consortium</kwd>
<kwd>Mild cognitive impairment</kwd>
</kwd-group>
</article-meta>
</front>
<body><sec><title>Background</title>
<p>The ageing of our populations, with the increasing prevalence of physical and cognitive disorders associated with age, poses a major burden on society [<xref ref-type="bibr" rid="B1">1</xref>
]. Making an impact on this disability burden requires an understanding of the risk and protective factors for age-related cognitive decline, frailty and chronic disease. The optimal approach to study this involves the longitudinal examination of population-based ageing cohorts. There are many such studies currently ongoing internationally, but there is considerable inconsistency in the results produced [<xref ref-type="bibr" rid="B2">2</xref>
] and further systematic examination of the existing evidence is required to determine findings which are robust.</p>
<p>Some of the variation in prevalence rates and risk factors identified across studies may be associated with regional and/or ethnic differences. For example, rates of non-amnestic mild cognitive impairment (MCI) are reported to be higher in blacks than whites from a similar geographical location, even when controlling for sex and education [<xref ref-type="bibr" rid="B3">3</xref>
]. However, a significant proportion of the variance between studies is likely attributable to differences in methodology, including differences in the assessment tools and performance criteria used for diagnosing cognitive disorders. Indeed, small but theoretically valid changes to how objective cognitive impairment was operationally defined led to greatly elevated prevalence rates, from 4% to 70% [<xref ref-type="bibr" rid="B4">4</xref>
]. Similarly, using different criteria for the diagnosis of dementia can result in vastly different prevalence figures [<xref ref-type="bibr" rid="B5">5</xref>
].</p>
<p>There are a number of approaches for overcoming methodological differences and other sources of heterogeneity so that studies can be more accurately compared and true differences identified. These include the use of standardised protocols, meta-analysis, and harmonisation of data [<xref ref-type="bibr" rid="B6">6</xref>
]. The use of standardised or even similar protocols is a rare feature of existing collaborations (the 10/66 Dementia Research Group is one exception [<xref ref-type="bibr" rid="B7">7</xref>
]), and meta-analysis is limited to published results. In contrast, data harmonisation offers the potential to explore both existing and novel research questions by a cost-effective use of previously-collected data.</p>
<p>Harmonising data across studies to create a single, large database helps to minimise the influence of both study-level (e.g., methodology) and individual level (e.g., demographic) factors, while also enabling these to be explored as potential contributors to differences in results [<xref ref-type="bibr" rid="B8">8</xref>
,<xref ref-type="bibr" rid="B9">9</xref>
]. Other advantages include increased statistical power for detecting effects, and the inherent replication and enhanced generalisability associated with using heterogeneous samples and methodologies [<xref ref-type="bibr" rid="B8">8</xref>
].</p>
<p>COSMIC (Cohort Studies of Memory in an International Consortium) is a recently established endeavour that aims to bring together cohort studies of cognitive ageing internationally in order to facilitate a better understanding of the determinants of cognitive ageing and neurocognitive disorders. The two main objectives of this project are to:</p>
<p>1. Harmonise shared, non-identifiable data from cohort studies that longitudinally examine change in cognitive function and the development of dementia in older individuals (60+ years).</p>
<p>2. Perform joint or mega-analyses using combined, harmonised data sets that yield collated results with enhanced statistical power, in addition to comparisons across geographical regions, ethnicities and sociocultural groups.</p>
<p>Other collaborations bringing together cohort studies of ageing include the genetics-focused CHARGE (Cohorts for Heart and Aging Research in Genomic Epidemiology) [<xref ref-type="bibr" rid="B10">10</xref>
] and ENIGMA (Enhancing NeuroImaging Genetics through Meta-Analysis) [<xref ref-type="bibr" rid="B11">11</xref>
]. Consortia with a particular interest in cognitive ageing include the UK-based HALCyon (Healthy Ageing across the Life Course) [<xref ref-type="bibr" rid="B12">12</xref>
], the primarily Europe-based CHANCES (Consortium on Health and Ageing: Network of Cohorts in Europe and the United States) [<xref ref-type="bibr" rid="B13">13</xref>
], the Australian-based DYNOPTA (Dynamic Analyses to Optimise Ageing) [<xref ref-type="bibr" rid="B14">14</xref>
], and the IALSA (Integrative Analysis of Longitudinal Studies on Aging) network [<xref ref-type="bibr" rid="B15">15</xref>
], which has member studies from Europe, North America and Australia. None of these consortia have any studies from Asia, where the current and future number of people with dementia is estimated to be greater than that of Europe and the Americas combined [<xref ref-type="bibr" rid="B1">1</xref>
]. COSMIC hopes to distinguish itself by being a truly international effort comprising studies with a clinical and biomedical focus from Asia, Europe, the Americas, and Oceania. COSMIC was established in 2012, with progress reported in 2013 [<xref ref-type="bibr" rid="B16">16</xref>
].</p>
</sec>
<sec><title>Methods/design</title>
<sec><title>Membership</title>
<p>Studies are eligible to participate in COSMIC if they meet the following membership criteria:</p>
<p>1. Are epidemiological, and therefore population-based.</p>
<p>2. Have a minimum sample size of 500.</p>
<p>3. Examine individuals aged 60 years and over.</p>
<p>4. Are longitudinal, with a minimum of two assessments.</p>
<p>5. Include assessment of cognitive function as an important, if not central, objective.</p>
<p>6. The outcome measures include dementia and/or cognitive impairment and/or cognitive decline.</p>
<p>Official enrolment in COSMIC involves a lead investigator having signed a memorandum of understanding that entails a willingness to share non-identifiable raw and/or processed data for joint or mega-analyses. Studies that, for institutional or other reasons, are unable to provide raw and/or processed data may participate in COSMIC as provisional members, if willing to provide results of in-house analyses conducted using COSMIC protocols. At the time of writing there are 14 officially enrolled and 3 provisional members of COSMIC. These studies, and their key demographic characteristics, are shown in Table <xref ref-type="table" rid="T1">1</xref>
. It is intended that the overall sample size and range of geographical regions and ethnicities represented be extended even further, and thus we ask that any study meeting the eligibility criteria consider contacting us to become a member of COSMIC. Studies from Africa, South America and Eastern Europe are particularly encouraged to join.</p>
<table-wrap position="float" id="T1"><label>Table 1</label>
<caption><p>COSMIC member studies</p>
</caption>
<table frame="hsides" rules="groups" border="1"><colgroup><col align="center"></col>
<col align="center"></col>
<col align="center"></col>
<col align="center"></col>
<col align="center"></col>
<col align="center"></col>
<col align="center"></col>
<col align="center"></col>
</colgroup>
<thead valign="top"><tr><th align="left"><bold>Study</bold>
</th>
<th align="center"><bold>Country</bold>
</th>
<th align="center"><bold>Sample size</bold>
</th>
<th align="center"><bold>Age range</bold>
</th>
<th align="center"><bold>Males </bold>
<bold>(%)</bold>
</th>
<th align="center"><bold>Main races/ethnicities</bold>
</th>
<th align="center"><bold>Start and end date</bold>
</th>
<th align="center"><bold>Key reference</bold>
<bold>(s)</bold>
</th>
</tr>
</thead>
<tbody valign="top"><tr><td align="center" valign="bottom">Canadian Study of Health and Aging (CSHA)<hr></hr>
</td>
<td align="center" valign="bottom">Canada<hr></hr>
</td>
<td align="center" valign="bottom">10263<hr></hr>
</td>
<td align="center" valign="bottom">65-102<hr></hr>
</td>
<td align="center" valign="bottom">43<hr></hr>
</td>
<td align="center" valign="bottom">Caucasian<hr></hr>
</td>
<td align="center" valign="bottom">1991-2002<hr></hr>
</td>
<td align="center" valign="bottom">CSHA Working Group (1994) [<xref ref-type="bibr" rid="B17">17</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Chinese Longitudinal Ageing Study (CLAS)<sup>*</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">China<hr></hr>
</td>
<td align="center" valign="bottom">3514<hr></hr>
</td>
<td align="center" valign="bottom">60+<hr></hr>
</td>
<td align="center" valign="bottom">44<hr></hr>
</td>
<td align="center" valign="bottom">Chinese<hr></hr>
</td>
<td align="center" valign="bottom">2010-<hr></hr>
</td>
<td align="center" valign="bottom">Xiao et al. (2013) [<xref ref-type="bibr" rid="B18">18</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Cognitive Function and Ageing Studies (CFAS)<sup>†</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">UK<hr></hr>
</td>
<td align="center" valign="bottom">13004<hr></hr>
</td>
<td align="center" valign="bottom">65+<hr></hr>
</td>
<td align="center" valign="bottom">40<hr></hr>
</td>
<td align="center" valign="bottom">Caucasian<hr></hr>
</td>
<td align="center" valign="bottom">1991-<hr></hr>
</td>
<td align="center" valign="bottom">Brayne et al. (2006) [<xref ref-type="bibr" rid="B19">19</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Einstein Aging Study (EAS)<sup>*</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">USA<hr></hr>
</td>
<td align="center" valign="bottom">1956<hr></hr>
</td>
<td align="center" valign="bottom">66-104<hr></hr>
</td>
<td align="center" valign="bottom">39<hr></hr>
</td>
<td align="center" valign="bottom">Caucasian/African American<hr></hr>
</td>
<td align="center" valign="bottom">1993-<hr></hr>
</td>
<td align="center" valign="bottom">Katz et al. (2012) [<xref ref-type="bibr" rid="B3">3</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Etude Santé Psychologique Prévalence Risques et Traitement (ESPRIT)<sup>*</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">France<hr></hr>
</td>
<td align="center" valign="bottom">2268<hr></hr>
</td>
<td align="center" valign="bottom">65+<hr></hr>
</td>
<td align="center" valign="bottom">42<hr></hr>
</td>
<td align="center" valign="bottom">Not recorded<hr></hr>
</td>
<td align="center" valign="bottom">1999-<hr></hr>
</td>
<td align="center" valign="bottom">Ritchie et al. (2010) [<xref ref-type="bibr" rid="B20">20</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Framingham Heart Study (FHS)<sup>†</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">USA<hr></hr>
</td>
<td align="center" valign="bottom">15328<sup>‡</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">5+<hr></hr>
</td>
<td align="center" valign="bottom">50<hr></hr>
</td>
<td align="center" valign="bottom">Caucasian<hr></hr>
</td>
<td align="center" valign="bottom">1948-<hr></hr>
</td>
<td align="center" valign="bottom">Dawber & Kannel (1958) [<xref ref-type="bibr" rid="B21">21</xref>
]; Feinleib et al. (1975) [<xref ref-type="bibr" rid="B22">22</xref>
]; Splansky et al. (2007) [<xref ref-type="bibr" rid="B23">23</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Hong Kong Memory and Ageing Prospective Study (HK-MAPS)<sup>*</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">Hong Kong<hr></hr>
</td>
<td align="center" valign="bottom">787<hr></hr>
</td>
<td align="center" valign="bottom">60+<hr></hr>
</td>
<td align="center" valign="bottom">46<hr></hr>
</td>
<td align="center" valign="bottom">Chinese<hr></hr>
</td>
<td align="center" valign="bottom">2005-<hr></hr>
</td>
<td align="center" valign="bottom">Wong et al. (2013) [<xref ref-type="bibr" rid="B24">24</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Korean Longitudinal Study on Cognitive Aging and Dementia (KLOSCAD)<hr></hr>
</td>
<td align="center" valign="bottom">South Korea<hr></hr>
</td>
<td align="center" valign="bottom">6479<hr></hr>
</td>
<td align="center" valign="bottom">60+<hr></hr>
</td>
<td align="center" valign="bottom">44<hr></hr>
</td>
<td align="center" valign="bottom">Korean<hr></hr>
</td>
<td align="center" valign="bottom">2009-<hr></hr>
</td>
<td align="center" valign="bottom">Kim et al. (2013) [<xref ref-type="bibr" rid="B25">25</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Mayo Clinic Study of Aging (MCSA)<sup>†</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">USA<hr></hr>
</td>
<td align="center" valign="bottom">4000<hr></hr>
</td>
<td align="center" valign="bottom">50-89<hr></hr>
</td>
<td align="center" valign="bottom">50<hr></hr>
</td>
<td align="center" valign="bottom">Caucasian<hr></hr>
</td>
<td align="center" valign="bottom">2004-<hr></hr>
</td>
<td align="center" valign="bottom">Roberts et al. (2008) [<xref ref-type="bibr" rid="B26">26</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Monongahela Valley Independent Elders Survey (MoVIES)<sup>*</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">USA<hr></hr>
</td>
<td align="center" valign="bottom">1681<hr></hr>
</td>
<td align="center" valign="bottom">65+<hr></hr>
</td>
<td align="center" valign="bottom">42<hr></hr>
</td>
<td align="center" valign="bottom">Caucasian<hr></hr>
</td>
<td align="center" valign="bottom">1987-2002<hr></hr>
</td>
<td align="center" valign="bottom">Ganguli et al. (2000) [<xref ref-type="bibr" rid="B27">27</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Personality and Total Health (PATH) Through Life Project<sup>*</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">Australia<hr></hr>
</td>
<td align="center" valign="bottom">2551<hr></hr>
</td>
<td align="center" valign="bottom">60-64<hr></hr>
</td>
<td align="center" valign="bottom">52<hr></hr>
</td>
<td align="center" valign="bottom">Caucasian<hr></hr>
</td>
<td align="center" valign="bottom">2001-<hr></hr>
</td>
<td align="center" valign="bottom">Anstey et al. (2012) [<xref ref-type="bibr" rid="B28">28</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Singapore Longitudinal Ageing Studies (SLAS) I and II<sup>*</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">Singapore<hr></hr>
</td>
<td align="center" valign="bottom">5748<hr></hr>
</td>
<td align="center" valign="bottom">54-98<hr></hr>
</td>
<td align="center" valign="bottom">37<hr></hr>
</td>
<td align="center" valign="bottom">Chinese<hr></hr>
</td>
<td align="center" valign="bottom">2003-<hr></hr>
</td>
<td align="center" valign="bottom">Feng et al. (2010, 2013) [<xref ref-type="bibr" rid="B29">29</xref>
,<xref ref-type="bibr" rid="B30">30</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Sydney Memory and Ageing Study (Sydney MAS)<sup>*</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">Australia<hr></hr>
</td>
<td align="center" valign="bottom">1037<hr></hr>
</td>
<td align="center" valign="bottom">70+<hr></hr>
</td>
<td align="center" valign="bottom">45<hr></hr>
</td>
<td align="center" valign="bottom">Caucasian<hr></hr>
</td>
<td align="center" valign="bottom">2005-<hr></hr>
</td>
<td align="center" valign="bottom">Sachdev et al. (2010) [<xref ref-type="bibr" rid="B31">31</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Tajiri Project<hr></hr>
</td>
<td align="center" valign="bottom">Japan<hr></hr>
</td>
<td align="center" valign="bottom">1654<hr></hr>
</td>
<td align="center" valign="bottom">65+<hr></hr>
</td>
<td align="center" valign="bottom">42<hr></hr>
</td>
<td align="center" valign="bottom">Japanese<hr></hr>
</td>
<td align="center" valign="bottom">1998-2005<hr></hr>
</td>
<td align="center" valign="bottom">Meguro et al. (2002) [<xref ref-type="bibr" rid="B32">32</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center" valign="bottom">Washington Heights Inwood and Columbia Aging Project (WHICAP)<sup>*</sup>
<hr></hr>
</td>
<td align="center" valign="bottom">USA<hr></hr>
</td>
<td align="center" valign="bottom">4577<hr></hr>
</td>
<td align="center" valign="bottom">63-103<hr></hr>
</td>
<td align="center" valign="bottom">32<hr></hr>
</td>
<td align="center" valign="bottom">Hispanic/African American/Caucasian<hr></hr>
</td>
<td align="center" valign="bottom">1989-<hr></hr>
</td>
<td align="center" valign="bottom">Tang et al. (2001) [<xref ref-type="bibr" rid="B33">33</xref>
]<hr></hr>
</td>
</tr>
<tr><td align="center">ZARADEMP Project (ZARAgoza DEMentia DEPression Project)<sup>*</sup>
</td>
<td align="center">Spain</td>
<td align="center">4803</td>
<td align="center">55+</td>
<td align="center">42</td>
<td align="center">Caucasian</td>
<td align="center">1994-</td>
<td align="center">Lobo et al. (2005) [<xref ref-type="bibr" rid="B34">34</xref>
]</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p><sup>*</sup>
Data for the first project have been made available.</p>
<p><sup>†</sup>
Provisional member.</p>
<p><sup>‡</sup>
Including 3 generations (Original cohort, Offspring, Grandchildren) and separate Omni cohort of 900 ethnic minority participants.</p>
</table-wrap-foot>
</table-wrap>
</sec>
<sec><title>Organisation</title>
<p>COSMIC has a Research Steering Committee comprising one representative from each participating study, generally the lead investigator or a delegate. The primary functions of the Research Steering Committee are:</p>
<p>1. To develop guidelines for the inclusion and exclusion of studies.</p>
<p>2. To provide rules of participation and guidelines for the roles and responsibilities of the participating studies.</p>
<p>3. To approve Workgroups.</p>
<p>4. To select topics of interest.</p>
<p>5. To provide overall analytic strategies.</p>
<p>6. To develop rules for publication, including authorship.</p>
<p>7. To develop rules for the protection of intellectual property, when relevant.</p>
<p>8. To seek funds to support COSMIC.</p>
</sec>
<sec><title>Meetings</title>
<p>An initial meeting of many (now member) study leaders on July 16, 2012 in Vancouver supported the official establishment of COSMIC. Potential projects, both initial and more long-term, and the steps needed to progress these were among the topics discussed. A subsequent meeting comprising many of the Research Steering Committee members was held on July 15, 2013 in Boston.</p>
</sec>
<sec><title>Website</title>
<p>A website has been established that contains a description of COSMIC and summaries of the member studies (<ext-link ext-link-type="uri" xlink:href="http://www.cheba.unsw.edu.au/group/cosmic">http://www.cheba.unsw.edu.au/group/cosmic</ext-link>
). This website is intended to serve as an avenue for presenting and preserving COSMIC project protocols and results, and will potentially house data restricted by password to COSMIC members. The Sydney team are currently responsible for the development and maintenance of the COSMIC website.</p>
</sec>
<sec><title>Ethics</title>
<p>The overall COSMIC project has been approved by the Human Research Ethics Committee of the University of New South Wales, Sydney. Member studies are responsible for obtaining approval (if considered necessary) from their local institutional review board for the sharing of data. However, de-identified data are not considered Protected Health information by the National Institute of Health of the USA. A protocol for the de-identification of data has been developed.</p>
</sec>
</sec>
<sec sec-type="discussion"><title>Discussion</title>
<sec><title>Challenges</title>
<p>General challenges facing large, international consortia have been previously described (e.g., by CHARGE [<xref ref-type="bibr" rid="B10">10</xref>
]). These include a potential need for additional funding to prolong the use of study data beyond initial anticipations, and timely and effective communication among members across different countries.</p>
<p>More specific to COSMIC are challenges associated with harmonisation, many of which have also been previously described [<xref ref-type="bibr" rid="B9">9</xref>
,<xref ref-type="bibr" rid="B35">35</xref>
]. The major challenge of harmonisation stems from differences between studies in the measurement instruments used and/or differences in how questions from similar instruments are worded and responses provided and categorised, including the effect of language and culture. Attempts to maximise the number of studies contributing to a final dataset can require that complex information from some studies be simplified (e.g., converted from a continuous measure to a categorical scale). There is a potential reduction in validity involved in simplifying data, but there are mechanisms by which this can be tested and/or quantified [<xref ref-type="bibr" rid="B9">9</xref>
].</p>
<p>Meeting the objectives of COSMIC will require various data types to be harmonised, but data relating to cognitive outcomes such as impairment and decline are likely to be the most challenging (i.e., more so than demographic and health-related variables). COSMIC member studies have operationally defined cognitive outcomes in vastly different ways. For example, for the purposes of diagnosing MCI, cognitive impairment has been variously defined as abnormal scores on the memory items of two cognitive status instruments (Mini-Mental State Examination and Geriatric Mental State Schedule) in the Zaragoza Dementia Depression Project [<xref ref-type="bibr" rid="B36">36</xref>
], and as a score on any measure from a comprehensive neuropsychological battery 1.5 or more standard deviations below published normative values in the Sydney Memory and Ageing Study [<xref ref-type="bibr" rid="B31">31</xref>
]. Different studies have used different neuropsychological test batteries, but even when similar cognitive tests have been used it is often the case that different versions have been used or the tests have been administered in a non-standard way. An added complication is the need to reconcile differences in the data while giving appropriate consideration to relevant demographic effects, including those associated with gender and education.</p>
</sec>
<sec><title>First project</title>
<p>The aim of the first COSMIC project is to compare the baseline prevalence of MCI across the COSMIC member cohorts and the different regions and ethnicities represented by these. The project is currently underway, and is being coordinated by the Sydney team. A questionnaire was developed and promulgated, with the information provided guiding a subsequent request for data from the studies on:</p>
<p>1. Demographics.</p>
<p>2. Sample representativeness.</p>
<p>3. Neuropsychological test performance.</p>
<p>4. Functional test scores.</p>
<p>5. Memory/cognitive complain/concerns.</p>
<p>6. Criteria used for MCI.</p>
<p>The receipt of data was followed by communication with data managers and/or study leaders to clarify the nature of data (e.g., the particular neuropsychological test used or manner of administration) and/or to ask that further data be provided (e.g., the individual items from a functional test scale in addition to a total score originally provided). Data from 11 studies have been made available for this project (see Table <xref ref-type="table" rid="T1">1</xref>
), and there is a total sample size of more than 23,000 non-demented individuals aged 60 and older.</p>
<p>Some demographic variables have been harmonised. All studies provided age in years, and harmonising sex only required some recoding to a common scale (female = 0; male = 1). Education was less straightforward. A four-level categorical scale of the highest level of education achieved (Less than high school completion, High school completion, Technical or college diploma, University degree) was chosen as the most appropriate common measure, and to which various other categorical formats or years of formal education were transformed (see Additional file <xref ref-type="supplementary-material" rid="S1">1</xref>
for the protocol). Data were provided in the harmonised format by the studies themselves, or later transformed from the original variable by the project coordinators.</p>
<p>The next step will be to harmonise the data needed to make classifications of MCI. The participating studies have published widely varying rates of MCI, from as low as 3.2% for the Monongahela Valley Independent Elders Survey [<xref ref-type="bibr" rid="B37">37</xref>
] to 34.8% for the Sydney Memory and Ageing Study [<xref ref-type="bibr" rid="B31">31</xref>
]. Differences between the studies in how MCI diagnoses were made have undoubtedly contributed to the varying prevalence rates [<xref ref-type="bibr" rid="B4">4</xref>
], and minimising this requires the harmonisation of data informing the four generally accepted criteria for MCI:</p>
<p>1. Absence of dementia.</p>
<p>2. No or minimal functional impairment.</p>
<p>3. Objective cognitive impairment.</p>
<p>4. Memory complaint or concern [<xref ref-type="bibr" rid="B38">38</xref>
,<xref ref-type="bibr" rid="B39">39</xref>
].</p>
</sec>
<sec><title>Future projects</title>
<p>A number of future projects utilising COSMIC data are currently planned, and aim to make comparisons across COSMIC cohorts, countries and ethnic groups of:</p>
<p>1. Risk and protective factors for MCI.</p>
<p>2. Rates of cognitive decline.</p>
<p>3. Biomarkers (e.g., blood, genetic and MRI-derived) of MCI and dementia.</p>
<p>Many of the existing member studies have relevant data to contribute to these projects. It is expected that additional projects will address more refined and specific topics addressing the overall objectives of COSMIC. This could include identifying and comparing rates of decline within particular cognitive domains, and establishing associations between untreated hypertension or non-traditional risk factors and cognitive decline. Projects like these will be enabled and facilitated by growing the COSMIC membership base to ensure that there are sufficient relevant data on variables not collected by all studies.</p>
</sec>
<sec><title>Extended Implications of COSMIC</title>
<p>The mechanisms for harmonising measures developed by COSMIC could produce standardised ways of collecting and reporting data that facilitate the comparability of longitudinal studies of ageing. This includes previous or existing studies, for which data could be reformatted and further analysed. It may also guide the choice of measures used or type of data collected by future studies, for which the capacity to directly compare results with those of many other cohorts would greatly enhance their interpretability and relevance.</p>
<p>There is also the potential for the COSMIC database to be made available to non-consortium researchers via the website, following consortia-based publications and with the approval of the Research Steering Committee. The scientific benefits of making large databases available to researchers worldwide are demonstrated by the more than 250 publications reported to have arisen from the sharing of ADNI (Alzheimer's Disease Neuroimaging Initiative) data across the internet [<xref ref-type="bibr" rid="B40">40</xref>
].</p>
<p>With these, and potentially further extended implications and uses of COSMIC data, member studies can be confident that their data are being fully utilised and that they are contributing to a truly global effort to understand and combat the problems associated with cognitive ageing, MCI and dementia.</p>
</sec>
</sec>
<sec sec-type="conclusions"><title>Conclusion</title>
<p>The COSMIC project is a truly international effort to inform the epidemiology of cognitive disorders associated with advanced age by identifying risk factors and biomarkers that are common as well as unique. It has the potential to transform our understanding of the epidemiology of cognitive ageing and have a world-wide impact on promoting successful ageing.</p>
</sec>
<sec><title>Abbreviations</title>
<p>COSMIC: Cohort Studies of Memory in an International Consortium; MCI: Mild cognitive impairment.</p>
</sec>
<sec><title>Competing interests</title>
<p>The authors declare that they have no competing interests, except for Kenneth Rockwood: Founder and shareholder of DGI Clinical; Richard Lipton and Mindy Katz have received monies from Bristol Myers Squibb Inc.; Ronald Petersen is on the Data Monitoring Boards of Pfizer Inc. and Janssen Alzheimer Immunotherapy, and a consultant to GE Healthcare; Rosebud Roberts has received a grant from Abbott Laboratories; Yaakov Stern is on the Advisory Boards of Janssen LLC, Pfizer Inc., Alzheimer’s Association and AbbVie, and has received Research Support from Piramal Research.</p>
</sec>
<sec><title>Authors’ contributions</title>
<p>PSS is the instigator and head of COSMIC, and together with DML drafted the manuscript. All authors contributed to their local study, contributed to critically revising the manuscript for important intellectual content, and approved the final version of the manuscript for submission.</p>
</sec>
<sec><title>Pre-publication history</title>
<p>The pre-publication history for this paper can be accessed here:</p>
<p><ext-link ext-link-type="uri" xlink:href="http://www.biomedcentral.com/1471-2377/13/165/prepub">http://www.biomedcentral.com/1471-2377/13/165/prepub</ext-link>
</p>
</sec>
<sec sec-type="supplementary-material"><title>Supplementary Material</title>
<supplementary-material content-type="local-data" id="S1"><caption><title>Additional file 1</title>
<p>Protocol for harmonising education across COSMIC member studies participating in the first project.</p>
</caption>
<media xlink:href="1471-2377-13-165-S1.docx"><caption><p>Click here for file</p>
</caption>
</media>
</supplementary-material>
</sec>
</body>
<back><sec><title>Acknowledgements</title>
<p><italic>Canadian Study of Health and Aging (CSHA)</italic>
: Kenneth Rockwood (study leader). Funding from the National Health Research Development Program of Health Canada (6605-3954-MC[S]).</p>
<p><italic>Chinese Longitudinal Ageing Study (CLAS)</italic>
: Shifu Xiao (study leader), Juan Li, Xia Li. The authors extend their thanks to the main investigators from across the different regions of China: Tao Wang, Muni Tang, Wei Chen, Feng Bao, Huali Wang, Yuping Wang, Ying Liu, Yaping Wang, Yefeng Yuan, Xiaoyun Zuo, Zhongming Chen, Xulai Zhang, Lijuan Cui, Wenyuan Wu, Mingyuan Zhang. Funding from a China Ministry of Science and Technology grant (2009BAI77B03).</p>
<p><italic>Cognitive Function and Ageing Studies (CFAS)</italic>
: Carol Brayne (study leader), Fiona E Matthews, Blossom CM Stephan. Funding from major awards from the Medical Research Council and the Department of Health, UK.</p>
<p><italic>Einstein Aging Study (EAS)</italic>
: Richard B Lipton (study leader), Mindy J Katz (study leader). The authors acknowledge the contributions of Molly Zimmerman and Carol Derby. Funding from National Institute on Health/National Institute on Aging grants: 5P01 AG003949, 1R03 AG045474.</p>
<p><italic>Etude Santé Psychologique Prévalence Risques et Traitement (ESPRIT)</italic>
: Karen Ritchie (study leader), Isabelle Carrière, Marie-Laure Ancelin (study leader). Funding from Novartis.</p>
<p><italic>Framingham Heart Study (FHS)</italic>
: Sudha Seshadri (study leader), Rhoda Au, Alexa S Beiser. The authors acknowledge the contributions of Philip A. Wolf and Galit A. Weinstein, and the dedication of the FHS participants. Funding from the National Heart, Lung and Blood Institute's Framingham Heart Study (Contract No. N01-HC-25195) and grants from the National Institute of Aging (AG08122, AG16495, AG033193), the National Institute of Neurological Disorders and Stroke (NS17950), and the National Heart, Lung and Blood Association (HL93029, U01HL 096917). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of Neurological Disorders and Stroke, the National Heart Lung and Blood Institute, the National Institute of Aging or the National Institutes of Health.</p>
<p><italic>Hong Kong Memory and Ageing Prospective Study (HK-MAPS)</italic>
: Linda CW Lam (study leader), Candy HY Wong, Ada WT Fung. The authors acknowledge the contributions of Grace T.Y. Leung, Wai Chi Chan, Department of Health of Hong Kong SAR, the participants and the social centers for their assistance in the assessment, and thank Novartis and Astra Zeneca for their sponsorship of souvenirs for the participants in the baseline study. The baseline study is funded in part by the Mr. Lai Seung Hung & Mrs. Lai Chan Pui Ngong Dementia in Hong Kong Research Fund, and by an educational fund from Eisai.</p>
<p><italic>Korean Longitudinal Study on Cognitive Aging and Dementia (KLOSCAD)</italic>
: Ki Woong Kim (study leader), Ji Won Han, Tae Hui Kim. Funding from a Korean Health Technology R&D Project grant from the Ministry for Health, Welfare, & Family Affairs, Republic of Korea (Grant No. A092077).</p>
<p><italic>Mayo Clinic Study of Aging (MCSA)</italic>
: Ronald C Petersen (study leader), Rosebud O Roberts, Michelle M Mielke. Funding from the National Institute on Aging: U01 AG006786, P50 AG016574, R01 AG034676.</p>
<p><italic>Monongahela Valley Independent Elders Survey (MoVIES)</italic>
: Mary Ganguli (study leader), Hiroko H Dodge, Tiffany Hughes. The authors acknowledge the contributions of 1681 study participants from the Monongahela Valley and of multiple MoVIES project personnel over the years. Funding from Grant # R01AG07562 from the National Institute on Aging, National Institutes of Health, United States Department of Health and Human Services.</p>
<p><italic>Personality and Total Health (PATH) Through Life Project</italic>
: Kaarin J Anstey (study leader), Nicolas Cherbuin, Peter Butterworth. The authors acknowledge the further study members Helen Christensen, Andrew MacKinnon, Simon Easteal, Project Managers Trish Jacomb, Karen Maxwell, participants and the NHMRC. Funding from National Health and Medical Research Council of Australia grants 973302, 179805, 157125 and 1002160.</p>
<p><italic>Singapore Longitudinal Ageing Studies (SLAS) I and II</italic>
: Tze Pin Ng (study leader), Qi Gao. The authors gratefully thank the help and support of the following voluntary welfare organizations: Geylang East Home for the Aged, Presbysterian Community Services, Thye Hua Kwan Moral Society (Moral Neighbourhood Links), Yuhua Neighbourhood Link, Henderson Senior Citizens’ Home, NTUC Eldercare Co-op Ltd, Thong Kheng Seniors Activity Centre (Queenstown Centre) and Redhill Moral Seniors Activity Centre. Funding from research grants (No. 03/121/17/214 and No. 08/1/21/19/567) from the Biomedical Research Council, Agency for Science, Technology and Research (A*STAR) in Singapore.</p>
<p><italic>Sydney Memory and Ageing Study (MAS)</italic>
: Perminder S Sachdev (study leader and consortium head), Darren M Lipnicki, Nicole A Kochan, John D Crawford, Simone Reppermund, Henry Brodaty (study leader). The authors acknowledge the contributions of members of the MAS Team: Allison Bowman, Kim Burns, Anthony Broe, Joula Dekker, Louise Dooley, Michele de Permentier, Sarah Fairjones, Janelle Fletcher, Therese French, Cathy Foster, Emma Nugent-Cleary-Fox, Chien Gooi, Evelyn Harvey, Rebecca Helyer, Sharpley Hsieh, Laura Hughes, Sarah Jacek, Mary Johnston, Donna McCade, Samantha Meeth, Eveline Milne, Angharad Moir, Ros O’Grady, Kia Pfaeffli, Carine Pose, Laura Reuser, Amanda Rose, Peter Schofield, Zeeshan Shahnawaz, Amanda Sharpley, Claire Thompson, Wiebke Queisser, and Sam Wong. Funding from a National Health & Medical Research Council of Australia Program Grant (ID 350833).</p>
<p><italic>Tajiri Project</italic>
: Kenichi Meguro (study leader). The author acknowledges the contributions of Mari Kasai, Kei Nakamura, and Masahiro Nakatsuka.</p>
<p><italic>Washington Heights Inwood and Columbia Aging Project (WHICAP)</italic>
: Nicole Schupf (study leader), Jennifer Manly, Yaakov Stern. The authors acknowledge the contributions of Richard Mayeux, Principal Investigator of the WHICAP study, co-investigators Adam Brickman and Jose Luchsinger, and study team members Danurys Sanchez, Ming X. Tang and Howard Andrews. Funding from the National Institute of Health/National Institute on Aging: Grants # R01 AG037212, P01 AG07232.</p>
<p><italic>ZARADEMP Project (ZARAgoza DEMentia DEPression Project)</italic>
: Antonio Lobo (study leader), Raúl Lopez-Anton, Javier Santabárbara. The authors acknowledge the further study members Guillermo Marcos, Concepción De-la-Cámara, Pedro Saz, Tirso Ventura, Miguel Angel Quintanilla, and Elena Lobo, and the contributions of the ZARADEMP Workgroup who participated in the study. Funding from the Fondo de Investigación Sanitaria, Instituto de Salud Carlos III, Spanish Ministry of Health, Madrid, Spain (grants 94/1562, 97/1321E, 98/0103, 01/0255, 03/0815, 06/0617, and G03/128) and Pfizer Foundation, Madrid.</p>
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