[Epidemiological studies in chronic bronchitis].
D000328:Adult; D000368:Aged; D000397:Air Pollution; D001991:Bronchitis / Q000453:epidemiology* / Q000209:etiology; D002908:Chronic Disease; D006801:Humans; D008875:Middle Aged; D012130:Respiratory Hypersensitivity / Q000150:complications; D012383:Romania; D012907:Smoking / Q000150:complications
Ercetări epidemiologiche în bronşita cronică.