1. Department of General Practice, Hunan Provincial People’s Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, China;
2. Department of Geriatrics, Hunan Provincial People’s Hospital, the First Affiliated Hospital of Hunan Normal University, Changsha, China;
3. Cardiovascular Department, Hunan Provincial People’s Hospital, the First Affiliated Hospital of Hunan Normal University, Changsha, China