1. From the Departments of Cardiology (Y.L., Y.X., W.L., S.T., Q.Z., Y.C.) and Radiology (X.L., J.S.), West China Hospital, Sichuan University, No. 37 Guo Xue Xiang, Chengdu 610041, China; Siemens Healthcare, Shanghai, China (X.Z.); and Cardiovascular Division, Department of Medicine, University of Pennsylvania, Philadelphia, Pa (Y.H.).