Xiaozhi Qin1, Ennan Fang1, Megumi Narisawa2, Xian Wu Cheng1,3. 1. Department of Cardiology, Yanbian University Hospital, Yanji, Jilin Province, China (X.Q., E.F., X.W.C.). 2. Department of Cardiology, Nagoya University Graduate School of Medicine, Aichiken, Japan (M.N.). 3. Department of Cardiology, Kyung Hee University Hospital, Seoul, Republic of Korea (X.W.C.).