Hasan, Kawa Muhamedamin, and Musaab Zubair Mohammad. “Prevalence of Pulmonary Hypertension Among Patients With β- Thalassemia Major in Erbil Province -Iraq”. Diyala Journal of Medicine, vol. 16, no. 2, June 2019, pp. 17-30, https://www.djm.uodiyala.edu.iq/index.php/djm/article/view/252.