1. Department of Cardiology, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R.�China
2. Department of Geriatrics, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R.�China
3. Department of Geriatrics, The Second Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China