Situmorang, E., A. K. Aman, and B. Lubis. “Coagulation Defects in Î’eta-Thalassemia Major Patients at Haji Adam Malik Hospital Medan”. Bali Medical Journal, vol. 8, no. 2, Aug. 2019, pp. 592-5, doi:10.15562/bmj.v8i2.1412.