A study of 340 cases of chronic bronchitis.
D000041:Absenteeism; D000208:Acute Disease; D000328:Adult; D000367:Age Factors; D000368:Aged; D001991:Bronchitis / Q000150:complications / Q000453:epidemiology* / Q000209:etiology / Q000401:mortality; D002908:Chronic Disease; D004185:Disability Evaluation; D004391:Dust; D004739:England; D005739:Gas Poisoning / Q000150:complications; D006801:Humans; D008297:Male; D008669:Metallurgy; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology*; D012141:Respiratory Tract Infections / Q000150:complications; D012189:Retrospective Studies; D012907:Smoking / Q000150:complications
D004391:Dust