title: Chronic bronchitis in agricultural and chemical workers.
mesh_terms: D000382:Agricultural Workers' Diseases; D001991:Bronchitis / Q000453:epidemiology*; D002617:Chemical Industry; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008297:Male; D009784:Occupational Diseases / Q000453:epidemiology*; D012737:Sex Factors; D012907:Smoking; D015022:Yugoslavia