Iftikhar Ali Kakar, Abdul Baqi, Nasir Azim, Hafsa Rafiq, Iqra Lodhi, Khalid Shahab. “Pulmonary Arterial Hypertension in COPD and Its Correlation With Disease Severity”. Pakistan Journal of Medical & Health Sciences 16, no. 12 (February 3, 2023): 391. Accessed November 21, 2024. https://mail.pjmhsonline.com/index.php/pjmhs/article/view/3705.