Zehra, Tehzeeb, Rahila Aamir, Uzma Batool, Wajahat Sultan Baig, Faisal Bacha, and Nimra Riaz. “Evaluating the Factors Affecting the Occurrence of Symptomatic COVID-19 Illness After Vaccination”. Pakistan Journal of Medical & Health Sciences 16, no. 02 (March 24, 2022): 139. Accessed December 22, 2024. https://mail.pjmhsonline.com/index.php/pjmhs/article/view/47.