Chaturvedi, Rahul, Khursheed Muzammil, Nirankar Singh, Sanjeev Davey, and Jai Veer Singh. “Prevalence of COPD in Rural Population, Muzaffarnagar”. Indian Journal of Community Health 27, no. 4 (December 31, 2015): 467–471. Accessed March 28, 2024. https://www.iapsmupuk.org/journal/index.php/IJCH/article/view/606.