[Epidemiological study of chronic bronchitis].
D001991:Bronchitis / Q000453:epidemiology*; D002908:Chronic Disease; D004813:Epidemiology / Q000592:standards; D006801:Humans; D008097:Lithuania; D011159:Population Surveillance; D014944:World Health Organization
Opyt epidemiologicheskogo issledovaniia khronicheskogo bronkhita.