1. Department of Radiology, West China Hospital, Sichuan University , Chengdu, Sichuan , P. R. China
2. Department of Cardiology, West China Hospital, Sichuan University , Guoxue Xiang No. 37, Chengdu, Sichuan 610041 , P. R. China
3. Department of Geriatrics, West China Hospital, Sichuan University , Chengdu, Sichuan , China
4. Cardiac Imaging Center, Cardiovascular Medicine Division, Wexner Medical Center, College of Medicine, The Ohio State University , Columbus, Ohio , USA