[Etiologic evaluation of chronic bronchitis in Japan].
D000328:Adult; 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