1. Department of Geriatric Medicine, Center of Coronary Circulation, Xiangya Hospital, Central South University , Changsha , China
2. Department of Geriatric Disease, National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University , Changsha , China
3. Department of Cardiovascular Medicine, The Third Xiangya Hospital, Central South University , Changsha , China
4. Department of Cardiovascular Medicine, Xiangya Hospital, Central South University , Changsha , China and