Hao Yang1, Kang Jun Fan2, Hui Wang1, Jia Hu3. 1. Department of Cardiology, West China Hospital of Sichuan University, Chengdu, China. 2. Department of Cardiovascular Surgery, West China Hospital of Sichuan University, Chengdu, China. 3. Department of Cardiovascular Surgery, West China Hospital of Sichuan University, Chengdu, China. Electronic address: humanjia@msn.com.