1. From the Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea (J.X., J-Y.H., Y.B.S., S-H.C., J-H.C., S.H.L., K.P.H., J.E.P., H-C.G); and Department of Cardiology, Tianjin First Central Hospital, Tianjin, China (J.X., C.L.).