<affiliation wicri:level="2"><nlm:affiliation>Department of Biostatistics and Epidemiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania. Electronic address: alisaste@mail.med.upenn.edu.</nlm:affiliation>
<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Pennsylvanie</region>
</placeName>
<wicri:cityArea>Department of Biostatistics and Epidemiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia</wicri:cityArea>
</affiliation>