| 329 | Humans |
| 189 | Female |
| 165 | Middle Aged |
| 165 | Aged |
| 147 | Male |
| 108 | Cost-Benefit Analysis |
| 99 | Adult |
| 95 | Computer Simulation |
| 79 | United States |
| 65 | Aged, 80 and over |
| 55 | Quality-Adjusted Life Years |
| 55 | Mass Screening |
| 50 | Models, Theoretical |
| 45 | Models, Statistical |
| 44 | Adolescent |
| 42 | Risk Factors |
| 41 | Models, Economic |
| 41 | Markov Chains |
| 37 | Age Factors |
| 36 | Health Care Costs |
| 35 | Sensitivity and Specificity |
| 30 | Risk Assessment |
| 29 | Models, Econometric |
| 29 | Incidence |
| 29 | Colorectal Neoplasms |
| 26 | Child |
| 25 | Treatment Outcome |
| 25 | Forecasting |
| 23 | Monte Carlo Method |
| 22 | Time Factors |
| 22 | Life Expectancy |
| 22 | Income |
| 22 | Breast Neoplasms |
| 21 | Health Policy |
| 21 | Early Detection of Cancer |
| 20 | Prevalence |
| 20 | Canada |
| 19 | Population Dynamics |
| 19 | Netherlands |
| 19 | Decision Support Techniques |
| 18 | Retirement |
| 18 | Quality of Life |
| 18 | Cohort Studies |
| 17 | Young Adult |
| 17 | HIV Infections |
| 17 | Demography |
| 16 | Survival Rate |
| 16 | Socioeconomic Factors |
| 16 | Social Security |
| 16 | Reproducibility of Results |
| 16 | Prognosis |
| 16 | Mammography |
| 16 | Disease Progression |
| 15 | Research |
| 15 | Models, Biological |
| 15 | Cost of Illness |
| 15 | Child, Preschool |
| 15 | Bone Density Conservation Agents |
| 15 | Animals |
| 14 | Software |
| 14 | Sex Factors |
| 14 | Osteoporosis |
| 14 | Infant |
| 14 | Health Expenditures |
| 14 | Family Characteristics |
| 14 | Drug Costs |
| 14 | Australia |
| 13 | Statistics as Topic |
| 13 | Population |
| 12 | Lung Neoplasms |
| 12 | Family |
| 12 | Decision Making |
| 12 | Colonoscopy |
| 11 | Uterine Cervical Neoplasms |
| 11 | Proportional Hazards Models |
| 11 | Probability |
| 11 | Outcome Assessment (Health Care) |
| 11 | Infant, Newborn |
| 11 | Heart Valve Prosthesis |
| 11 | Health Services Needs and Demand |
| 11 | Employment |
| 11 | Aortic Valve |
| 10 | Risk |
| 10 | Occult Blood |
| 10 | Insurance, Health |
| 10 | Insurance Coverage |
| 10 | Europe |
| 10 | Costs and Cost Analysis |
| 10 | Bioprosthesis |
| 9 | Survival Analysis |
| 9 | Smoking |
| 9 | Public Policy |
| 9 | National Health Programs |
| 9 | Medicare |
| 9 | Income Tax |
| 9 | Health Status |
| 9 | Follow-Up Studies |
| 9 | Fertility |
| 9 | Data Collection |
| 8 | Spain |
| 8 | Poverty |
| 8 | Population Surveillance |
| 8 | Mortality |
| 8 | Marriage |
| 8 | Health Benefit Plans, Employee |
| 8 | Fractures, Bone |
| 8 | Drug Therapy, Combination |
| 8 | Chronic Disease |
| 8 | Cardiovascular Diseases |
| 8 | Belgium |
| 8 | Anti-HIV Agents |
| 8 | Aging |
| 7 | Taxes |
| 7 | Salaries and Fringe Benefits |
| 7 | Regression Analysis |
| 7 | Randomized Controlled Trials as Topic |
| 7 | Prostatic Neoplasms |
| 7 | Prostate-Specific Antigen |
| 7 | Predictive Value of Tests |
| 7 | Policy Making |
| 7 | Physicians |
| 7 | Pensions |
| 7 | Patient Acceptance of Health Care |
| 7 | Papillomavirus Infections |
| 7 | Osteoporosis, Postmenopausal |
| 7 | Longitudinal Studies |
| 7 | Health Services Research |
| 7 | Health Services Accessibility |
| 7 | Great Britain |
| 7 | Evaluation Studies as Topic |
| 7 | Disabled Persons |
| 7 | Diabetes Mellitus, Type 2 |
| 7 | Delivery of Health Care |
| 7 | Cross-Sectional Studies |
| 7 | Algorithms |
| 6 | Stochastic Processes |
| 6 | Severity of Illness Index |
| 6 | Program Evaluation |
| 6 | Pregnancy |
| 6 | Neoplasm Staging |
| 6 | Myocardial Infarction |
| 6 | Models, Cardiovascular |
| 6 | Hospitalization |
| 6 | Heart Valve Prosthesis Implantation |
| 6 | Heart Valve Diseases |
| 6 | Health Planning |
| 6 | Financing, Personal |
| 6 | Emigration and Immigration |
| 6 | Eligibility Determination |
| 6 | Disease Outbreaks |
| 6 | Developing Countries |
| 6 | Developed Countries |
| 6 | Data Interpretation, Statistical |
| 6 | Cost Savings |
| 6 | Birth Rate |
| 6 | Antibodies, Monoclonal, Humanized |
| 6 | Alendronate |
| 6 | Age Distribution |
| 6 | Activities of Daily Living |
| 5 | Vaginal Smears |
| 5 | Stroke |
| 5 | South Africa |
| 5 | SEER Program |
| 5 | Retrospective Studies |
| 5 | Residence Characteristics |
| 5 | Research Design |
| 5 | Reoperation |
| 5 | Public Health |
| 5 | Patient Compliance |
| 5 | Papillomavirus Vaccines |
| 5 | Osteoporotic Fractures |
| 5 | Neoplasms |
| 5 | Models, Organizational |
| 5 | India |
| 5 | Health Surveys |
| 5 | Health Care Reform |
| 5 | France |
| 5 | Financing, Government |
| 5 | Feces |
| 5 | Family Planning Services |
| 5 | Cost Sharing |
| 5 | Colonography, Computed Tomographic |
| 5 | Antibodies, Monoclonal |
| 5 | Ambulatory Care |
| 5 | Adenoma |
| 5 | Acquired Immunodeficiency Syndrome |
| 4 | Urban Population |
| 4 | Tomography, X-Ray Computed |
| 4 | Specialization |
| 4 | Smoking Cessation |
| 4 | Sexual Behavior |
| 4 | Rural Population |
| 4 | Prosthesis Failure |
| 4 | Private Sector |
| 4 | Postoperative Complications |
| 4 | Population Growth |
| 4 | Pilot Projects |
| 4 | Patient Protection and Affordable Care Act |
| 4 | Onchocerciasis |
| 4 | Mental Disorders |
| 4 | Medically Uninsured |
| 4 | Logistic Models |
| 4 | Insurance, Pharmaceutical Services |
| 4 | Insect Vectors |
| 4 | Influenza, Human |
| 4 | Health Resources |
| 4 | Health Manpower |
| 4 | Genetic Predisposition to Disease |
| 4 | False Positive Reactions |
| 4 | Emigrants and Immigrants |
| 4 | Educational Status |
| 4 | Economics |
| 4 | Divorce |
| 4 | Disease-Free Survival |
| 4 | Diphosphonates |
| 4 | Diabetes Mellitus |
| 4 | Depression |
| 4 | Coronary Artery Bypass |
| 4 | Consumer Satisfaction |
| 4 | Confidence Intervals |
| 4 | Comparative Effectiveness Research |
| 4 | Clinical Trials as Topic |
| 4 | Case-Control Studies |
| 4 | Carcinoma, Non-Small-Cell Lung |
| 4 | California |
| 4 | Calibration |
| 4 | CD4 Lymphocyte Count |
| 4 | Antiretroviral Therapy, Highly Active |
| 4 | Albuminuria |
| 4 | Absorptiometry, Photon |
| 3 | Swine |
| 3 | Sweden |
| 3 | Stents |
| 3 | Social Environment |
| 3 | Small-Area Analysis |
| 3 | Sex Distribution |
| 3 | Ritonavir |
| 3 | Risk-Taking |
| 3 | Recurrence |
| 3 | Prosthesis Design |
| 3 | Practice Guidelines as Topic |
| 3 | Population Characteristics |
| 3 | Platelet Aggregation Inhibitors |
| 3 | Patient Selection |
| 3 | Palpation |
| 3 | Outcome and Process Assessment (Health Care) |
| 3 | Onchocerca volvulus |
| 3 | Obesity |
| 3 | Nursing Homes |
| 3 | Nova Scotia |
| 3 | Neoplasms, Radiation-Induced |
| 3 | Needs Assessment |
| 3 | Medicine |
| 3 | Medication Adherence |
| 3 | Medicaid |
| 3 | Marital Status |
| 3 | Lung Transplantation |
| 3 | Lung Diseases |
| 3 | Lopinavir |
| 3 | Longevity |
| 3 | Life Tables |
| 3 | Ivermectin |
| 3 | Ireland |
| 3 | Investments |
| 3 | Internationality |
| 3 | Homes for the Aged |
| 3 | Health Status Disparities |
| 3 | Health Behavior |
| 3 | HIV-1 |
| 3 | Government Regulation |
| 3 | Germany |
| 3 | Filaricides |
| 3 | Family Practice |
| 3 | Epidemiologic Methods |
| 3 | England |
| 3 | Empirical Research |
| 3 | Early Diagnosis |
| 3 | Dementia |
| 3 | Databases, Factual |
| 3 | Coronary Disease |
| 3 | Contraception Behavior |
| 3 | Continental Population Groups |
| 3 | Comorbidity |
| 3 | Communicable Disease Control |
| 3 | Commerce |
| 3 | Combined Modality Therapy |
| 3 | Cluster Analysis |
| 3 | Cervical Intraepithelial Neoplasia |
| 3 | Bone Density |
| 3 | Body Mass Index |
| 3 | Biopsy |
| 3 | Automatic Data Processing |
| 3 | Atrial Fibrillation |
| 3 | Asia |
| 3 | Antirheumatic Agents |
| 3 | Antineoplastic Agents |
| 3 | Anticoagulants |
| 3 | Angioplasty, Balloon, Coronary |
| 3 | Adenocarcinoma |
| 2 | Wuchereria bancrofti |
| 2 | Workload |
| 2 | Widowhood |
| 2 | Warfarin |
| 2 | Waiting Lists |
| 2 | Vulnerable Populations |
| 2 | Visual Acuity |
| 2 | Vision Disorders |
| 2 | Vaccination |
| 2 | Utilization Review |
| 2 | Urban Health Services |
| 2 | Universal Coverage |
| 2 | United States Social Security Administration |
| 2 | Uganda |
| 2 | Triage |
| 2 | Tobacco Products |
| 2 | Tissue Plasminogen Activator |
| 2 | Tissue Donors |
| 2 | Ticlopidine |
| 2 | Thrombolytic Therapy |
| 2 | Thromboembolism |
| 2 | Thiophenes |
| 2 | Thailand |
| 2 | Teriparatide |
| 2 | Tamoxifen |
| 2 | Switzerland |
| 2 | Spinal Diseases |
| 2 | Social Welfare |
| 2 | Social Sciences |
| 2 | Simuliidae |
| 2 | Sepsis |
| 2 | Schistosomiasis |
| 2 | Rural Health |
| 2 | Rural Health Services |
| 2 | Risk Reduction Behavior |
| 2 | Reverse Transcriptase Inhibitors |
| 2 | Resource Allocation |
| 2 | Reproduction |
| 2 | Reimbursement Mechanisms |
| 2 | Referral and Consultation |
| 2 | Rectal Neoplasms |
| 2 | Receptors, Tumor Necrosis Factor |
| 2 | Radiation Dosage |
| 2 | Pyrimidines |
| 2 | Pyridines |
| 2 | Public Assistance |
| 2 | Prospective Studies |
| 2 | Preventive Health Services |
| 2 | Pneumonia, Bacterial |
| 2 | Pneumococcal Vaccines |
| 2 | Pneumococcal Infections |
| 2 | Piperazines |
| 2 | Patient Preference |
| 2 | Patient Care Team |
| 2 | Patient Care Planning |
| 2 | Patient Admission |
| 2 | Parity |
| 2 | Parents |
| 2 | Papillomaviridae |
| 2 | Papanicolaou Test |
| 2 | Ovarian Neoplasms |
| 2 | Organometallic Compounds |
| 2 | Ontario |
| 2 | Oligopeptides |
| 2 | Odds Ratio |
| 2 | Observer Variation |
| 2 | Nuclear Family |
| 2 | New Zealand |
| 2 | Neoplasm Grading |
| 2 | National Health Insurance, United States |
| 2 | Motivation |
| 2 | Mothers |
| 2 | Morbidity |
| 2 | Models, Psychological |
| 2 | Models, Genetic |
| 2 | Middle East |
| 2 | Microcomputers |
| 2 | Methods |
| 2 | Medical History Taking |
| 2 | Mathematics |
| 2 | Mass Vaccination |
| 2 | Marketing of Health Services |
| 2 | Magnetic Resonance Imaging |
| 2 | Long-Term Care |
| 2 | Liver Failure |
| 2 | Leprosy |
| 2 | Lactation |
| 2 | Kidney Diseases |
| 2 | Japan |
| 2 | Italy |
| 2 | Insurance Selection Bias |
| 2 | Influenza Vaccines |
| 2 | Influenza A Virus, H1N1 Subtype |
| 2 | Infertility |
| 2 | Immunochemistry |
| 2 | Illegitimacy |
| 2 | Hypoglycemic Agents |
| 2 | Hyperlipidemias |
| 2 | Hydroxymethylglutaryl-CoA Reductase Inhibitors |
| 2 | Human papillomavirus 18 |
| 2 | Human papillomavirus 16 |
| 2 | Hospitals |
| 2 | History, 21st Century |
| 2 | History, 20th Century |
| 2 | Healthcare Disparities |
| 2 | Health Status Indicators |
| 2 | Health Services for the Aged |
| 2 | Health Personnel |
| 2 | Health Care Surveys |
| 2 | Health Care Rationing |
| 2 | HIV Protease Inhibitors |
| 2 | Glucocorticoids |
| 2 | Glaucoma |
| 2 | Glaucoma, Open-Angle |
| 2 | Geriatric Assessment |
| 2 | Genes, BRCA1 |
| 2 | Frail Elderly |
| 2 | Finland |
| 2 | Fibrinolytic Agents |
| 2 | Fees and Charges |
| 2 | Feasibility Studies |
| 2 | Far East |
| 2 | Family Health |
| 2 | Evidence-Based Practice |
| 2 | Evidence-Based Medicine |
| 2 | European Continental Ancestry Group |
| 2 | Environment Design |
| 2 | Emergency Service, Hospital |
| 2 | Elephantiasis, Filarial |
| 2 | Electrocardiography |
| 2 | Efficiency, Organizational |
| 2 | Drug Utilization |
| 2 | Drug Resistance, Viral |
| 2 | Drug Prescriptions |
| 2 | Drug Administration Schedule |
| 2 | Disability Evaluation |
| 2 | Direct Service Costs |
| 2 | Diabetic Retinopathy |
| 2 | Diabetic Angiopathies |
| 2 | Deoxycytidine |
| 2 | Decision Support Systems, Clinical |
| 2 | Decision Making, Computer-Assisted |
| 2 | Databases as Topic |
| 2 | Cytological Techniques |
| 2 | Critical Care |
| 2 | Coronary Artery Disease |
| 2 | Coronary Angiography |
| 2 | Contraception |
| 2 | Contact Tracing |
| 2 | Clinical Trials, Phase III as Topic |
| 2 | Choice Behavior |
| 2 | China |
| 2 | Chest Pain |
| 2 | Censuses |
| 2 | Cause of Death |
| 2 | Cattle |
| 2 | Catheter Ablation |
| 2 | Carcinoma |
| 2 | Carcinoma, Small Cell |
| 2 | Breast Feeding |
| 2 | Blood Pressure |
| 2 | Bias (Epidemiology) |
| 2 | Benzamides |
| 2 | Back Pain |
| 2 | Automobile Driving |
| 2 | Aspirin |
| 2 | Arthritis |
| 2 | Arthritis, Rheumatoid |
| 2 | Aortic Valve Insufficiency |
| 2 | Antibodies, Monoclonal, Murine-Derived |
| 2 | Anti-Retroviral Agents |
| 2 | Amputation |
| 2 | Alzheimer Disease |
| 2 | African Americans |
| 2 | Africa |
| 2 | Africa, Western |
| 2 | Africa South of the Sahara |
| 2 | Acute Coronary Syndrome |
| 2 | Actuarial Analysis |
| 2 | Absenteeism |
| 1 | gamma-Aminobutyric Acid |
| 1 | beta-Alanine |
| 1 | alpha 1-Antitrypsin Deficiency |
| 1 | Workplace |
| 1 | Women, Working |
| 1 | Women's Health |
| 1 | Women's Health Services |
| 1 | Wet Macular Degeneration |
| 1 | Wales |
| 1 | Waist-Hip Ratio |
| 1 | Vitamin K 2 |
| 1 | Vitamin K 1 |
| 1 | Vital Statistics |
| 1 | Visually Impaired Persons |
| 1 | Visual Perception |
| 1 | Visual Fields |
| 1 | Vision Screening |
| 1 | Viral Tropism |
| 1 | Viral Load |
| 1 | Videotape Recording |
| 1 | Uterine Cervical Dysplasia |