title: Chronic obstructive lung disease in Delhi. A comparative study.
mesh_terms: D000328:Adult; D000368:Aged; D002641:Chicago; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007194:India; D008131:London; D008171:Lung Diseases / Q000175:diagnosis* / Q000453:epidemiology / Q000503:physiopathology; D008173:Lung Diseases, Obstructive / Q000453:epidemiology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D011795:Surveys and Questionnaires