Chaturvedi R, Muzammil K, Singh N, Davey S, Singh JV. Prevalence of COPD in rural population, Muzaffarnagar. Indian J Community Health [Internet]. 2015 Dec. 31 [cited 2024 Jul. 22];27(4):467-71. Available from: https://iapsmupuk.org/journal/index.php/IJCH/article/view/606