[Chronic bronchitis among workers in a number of occupations and the smoking factor].
D001991:Bronchitis / Q000453:epidemiology*; D002908:Chronic Disease; D006801:Humans; D008297:Male; D009790:Occupations; D012907:Smoking
Khronicheskiĭ bronkhit u rabochikh riada professiĭ i faktor kureniia.