“Levels of Some Blood Clotting Factors in COVID-19 Patients: Comparative Study Before and After Pfizer- BioNTech Vaccinations”. Iraqi Journal of Science 64, no. 10 (October 30, 2023): 4911–4917. Accessed May 20, 2024. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/7762.