Khan, H.B. , Khattak, M.S. , Durrani, M. , Hussain, A. , Khan, S.Y. and Rehman, A.U. 2021. Exploring the Role of Vitamin D3 in Addressing Lung Dysfunction and Small Airways Degeneration in Chronic Obstructive Pulmonary Disease . Pakistan Journal of Chest Medicine. 27, 4 (Dec. 2021), 310–315.