“Off-Pump Coronary Artery Bypass Grafting (OPCAB) at Sudan Heart Institute : Is it a Safe Operation for Coronary Revascularization in Sudan?”, GJMR, vol. 14, no. I1, pp. 29–34, Jan. 2014, Accessed: Jan. 23, 2026. [Online]. Available: https://medicalresearchjournal.org/index.php/GJMR/article/view/531