Yangyang Xiao1, Yuyan Cai2, Hong Tang2, Xijun Xiao3. 1. School of Medicine, University of Queensland, Brisbane, Australia. 2. Department of Cardiology, West China Hospital of Sichuan University, Chengdu, China. 3. Department of Cardiovascular Surgery, West China Hospital of Sichuan University, 37 Guoxue Xiang, Chengdu, Sichuan 610041, China.