W. Issa Y, M. Salih S. Evaluating the Effectiveness of Pfizer, AstraZeneca, and Sinopharm Vaccines Against COVID-19 in Iraq: A Cross-Sectional Study of Vaccine Efficacy and Symptom Severity. JMAUC [Internet]. 2024May1 [cited 2024Nov.21];16(1):11-. Available from: https://journal.mauc.edu.iq/index.php/JMAUC/article/view/507