[ON THE EPIDEMIOLOGY OF CHRONIC DISEASES AND VARIOUS METHODS OF EPIDEMIOLOGICAL STUDY].
D002908:Chronic Disease; D016021:Epidemiologic Studies; D004813:Epidemiology; D006801:Humans
CHRONIC DISEASE; EPIDEMIOLOGY
O EPIDEMIOLOGII CHOR'OB PRZEWLEKLYCH I NIEKT'ORYCH METODACH BADA'N EPIDEMIOLOGICZNYCH.