1. Department of Geriatrics, The General Hospital of Western Theater Command, Chengdu, Sichuan, P.R. China
2. Department of Dermatology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, P.R. China
3. Department of Cardiology, Clinical Medical College & Affiliated Hospital of Chengdu University, Chengdu, P.R. China
4. Department of Cardiology, West China Hospital, Sichuan University, Sichuan, P.R. China
5. Department of Cardiology, The General Hospital of Western Theater Command, Chengdu, Sichuan, P.R. China