Letter: Relationship between lung cancer and chronic bronchitis.
D000402:Airway Obstruction / Q000150:complications; D001991:Bronchitis / Q000150:complications*; D002908:Chronic Disease; D006801:Humans; D008175:Lung Neoplasms / Q000150:complications*; D008297:Male; D012907:Smoking / Q000150:complications