Piryani, Rano Mal, and Suneel Piryani. “COPD in Non-Smokers in South Asia: An Under Estimated and Unrecognized Condition”. Journal of Liaquat University of Medical & Health Sciences 22, no. 03 (October 4, 2023): 154. Accessed November 15, 2024. http://121.52.154.205/index.php/jlumhs/article/view/1259.