1. Department of Geriatric Cardiology, National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China
2. Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, P.R. China
3. Nankai University School of Medicine, Nankai University, Tianjin 300073, China