Shahla Faisal, Kiran Hayat Khan, Mohsin Ali, Faisal Maqbool Zahid, Muhammad Sajjad Iqbal, and Bushra Aslam. “ASSESSMENT OF RISK FACTORS OF COVID-19 SEVERITY AND MORTALITY USING META-ANALYSIS”. Journal of Population Therapeutics and Clinical Pharmacology 31, no. 5 (May 23, 2024): 1272–1284. Accessed September 18, 2025. https://www.jptcp.com/index.php/jptcp/article/view/6079.