[The problem of nonrespondents].
D001161:Arteriosclerosis / Q000453:epidemiology; D003604:Czechoslovakia; D004812:Epidemiologic Methods / Q000592:standards*; D006801:Humans; D006973:Hypertension / Q000453:epidemiology; D014505:Urban Population
Príspĕvek k problematice nerespondentů.