Levels of Some Blood Clotting Factors in COVID-19 Patients: Comparative Study Before and After Pfizer- BioNTech Vaccinations. Iraqi Journal of Science, [S. l.], v. 64, n. 10, p. 4911–4917, 2023. DOI: 10.24996/ijs.2023.64.10.2. Disponível em: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/7762.. Acesso em: 7 apr. 2025.