“Effect of Coronary Collateral Circulation on Preoperative and Postoperative QT Dispersion in Patients Undergoing Coronary Artery Bypass Grafting. ”. Annals of Medical Research 14, no. 1 (May 25, 2021). Accessed October 25, 2025. http://www.annalsmedres.org/index.php/aomr/article/view/3149.