LIN, H.; HOU, J.; TANG, H.; CHEN, K.; GUO, S.; WANG, L.; SUN, H.; ZHENG, Z.; HU, S. A Novel Risk Stratification System for Predicting In-Hospital Mortality Following Coronary Artery Bypass Grafting Surgery with Impaired Left Ventricular Ejection Fraction. The Heart Surgery Forum, v. 23, n. 5, p. E621-E626, 28 Aug. 2020.