1.
Khan AA, Ali S, Ashraf S, Afridi MZ. Frequency of Common Risk factors in Patients with stable Chronic Obstructive Pulmonary Disease. Pak J Chest Med [Internet]. 2016Oct.15 [cited 2026Jun.12];22(2):55-60. Available from: https://www.pjcm.net/index.php/pjcm/article/view/390