1. Department of Cardiovascular Surgery, West China Hospital, Sichuan University , No. 37 Guoxue Alley , Chengdu, 610041 Sichuan, P.R. China
2. Department of Cardiology, West China Hospital, Sichuan University , No. 37 Guoxue Alley , Chengdu, 610041 Sichuan, P.R. China