Maula, Fazli, M Nadeem khan, Muhammad Adil, Javed Ullah, Abdul Rauf, and Sami ullah. “ECHOCARDIOGRAPHIC FINDINGS IN CHRONIC OBSTRUCTIVE PULMONARY DISEASE (COPD) PATIENTS”. Pakistan Journal of Chest Medicine 19, no. 1 (May 24, 2015). Accessed May 31, 2026. https://www.pjcm.net/index.php/pjcm/article/view/48.