Profile of chronic bronchitis at Shimla.
D000328:Adult; D000368:Aged; D001991:Bronchitis / Q000453:epidemiology* / Q000209:etiology; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012737:Sex Factors