Epidemiology for the uninitiated. Aetiology--comparison between communities.
D000328:Adult; D002648:Child; D003431:Cross-Cultural Comparison; D003710:Demography; D004043:Dietary Fiber; D004194:Disease / Q000209:etiology; D004641:Emigration and Immigration; D004812:Epidemiologic Methods; D006801:Humans; D013997:Time Factors