Epidemiological methods in the study of asthma.
D000293:Adolescent; D000328:Adult; D001249:Asthma / Q000453:epidemiology* / Q000401:mortality; D002648:Child; D002675:Child, Preschool; D004739:England; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D011446:Prospective Studies; D011897:Random Allocation; D012129:Respiratory Function Tests; D012189:Retrospective Studies; D012306:Risk; D014798:Vital Statistics