Malik, Muhammad Omar, and Syed Hamid Habib. “COVID19 and Cell Mediated Immunity; The Missing Link of Disease Severity”. Advances in Basic Medical Sciences 5, no. 1 (August 19, 2021): 1–2. Accessed January 17, 2022. https://abms.kmu.edu.pk/index.php/abms/article/view/186.