title: Prevalence of chronic bronchitis in a group of North Indian Adults (preliminary observations).
mesh_terms: D000293:Adolescent; D000328:Adult; D001991:Bronchitis / Q000150:complications / Q000453:epidemiology*; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D012907:Smoking / Q000150:complications