Elbager, Sahar, Samah Abd Alla, Tahani Mursal, and Amar A. Dowd. “Association of Activated Partial Thromboplastin Time and Fibrinogen Level in Patients With Polycythemia Vera”. Journal of Cancer and Tumor International 4, no. 4 (November 29, 2016): 1-7. Accessed September 28, 2020. https://journaljcti.com/index.php/JCTI/article/view/19315.