Lin, H., J. Hou, H. Tang, K. Chen, S. Guo, L. Wang, H. Sun, Z. Zheng, and S. Hu. “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, vol. 23, no. 5, Aug. 2020, pp. E621-E626, doi:10.1532/hsf.3089.