New research opportunities associated with national data sets.
D004812:Epidemiologic Methods; D005500:Follow-Up Studies; D006306:Health Surveys; D006801:Humans; D007256:Information Systems; D007407:Interviews as Topic; D007592:Joint Diseases / Q000000981:diagnostic imaging; D009135:Muscular Diseases / Q000453:epidemiology; D009309:National Center for Health Statistics, U.S.; D009749:Nutrition Surveys; D011859:Radiography; D012106:Research; D012216:Rheumatic Diseases / Q000453:epidemiology; D014481:United States