“Off-Pump Coronary Artery-Bypass Grafting (OPCAB) at Sudan Heart Institute : Is It A Safe Operation for Coronary Revascularization in Sudan?”. Global Journal of Medical Research 14, no. 4 (February 3, 2014): 29–34. Accessed October 23, 2026. https://medicalresearchjournal.org/index.php/GJMR/article/view/.