Hama HA, Abdullah SK, Rauof R, Othman Z. Correlation Between ABO Blood Group System and COVID-19 Severity in Erbil. EAJSE [Internet]. 2023 Jun. 21 [cited 2026 Apr. 19];9(2):154-9. Available from: https://eajse.tiu.edu.iq/index.php/eajse/article/view/58