Prevalence of chronic bronchitis symptoms in Japan.
D000328:Adult; D001991:Bronchitis / Q000453:epidemiology* / Q000209:etiology; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D012907:Smoking / Q000150:complications; D011795:Surveys and Questionnaires