1. Department of Cardiology, Shanghai Tenth People's Hospital, Qidong People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
2. Department of Geriatrics, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
3. Department of Cardiology, Shanghai Yoda Cardiothoracic Hospital, Shanghai 200012, P.R China