1. Department of Cardiology, Zhejiang Hospital, Hangzhou, Zhejiang 310013, P.R. China
2. Department of Medicine, School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang 325035, P.R. China
3. Department of Cardiology, Pingxiang City People's Hospital, Pingxiang, Jiangxi 337055, P.R. China
4. Department of Medicine, The Second College of Clinical Medicine, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, P.R. China