Shahzad F, Aman Nasir H, Yousaf A, Qasmi A, Nayyar N, Intisar RF. Comparison of severity of COVID-19 symptoms in Vaccinated versus Unvaccinated people; A Retrospective Cross-sectional study. sjrmu [Internet]. 2024 Aug. 19 [cited 2025 Apr. 10];27(S-1):40-8. Available from: https://supp.journalrmc.com/index.php/public/article/view/191