title: Chronic bronchitis in an urban locality of New Delhi--an epidemiological survey.
mesh_terms: D000293:Adolescent; D000328:Adult; D001991:Bronchitis / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D014505:Urban Population