title: Epidemiological study of chronic bronchitis with special reference to effect of air pollution.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000397:Air Pollution; D001991:Bronchitis / Q000453:epidemiology* / Q000209:etiology; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D012907:Smoking / Q000150:complications; D013458:Sulfur Dioxide / Q000633:toxicity
chemical_list: D013458:Sulfur Dioxide