Chronic bronchitis. Report on the third and fourth stages of the co-ordinated study of chronic bronchitis in the Department of Veterans Affairs, Canada.
D000328:Adult; D000397:Air Pollution; D001991:Bronchitis; D002170:Canada; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012129:Respiratory Function Tests