title: An easy method of spirometry.
authors.forename: H D
authors.initials: HD
authors.lastname: Singh
mesh_terms: D006801:Humans; D007194:India / Q000453:epidemiology; D008173:Lung Diseases, Obstructive / Q000453:epidemiology*; D008176:Lung Volume Measurements; D008403:Mass Screening; D013147:Spirometry / Q000379:methods*