1. Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, China
2. National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Changsha, Hunan, China
3. Department of Rheumatology and Immunology (T.X.), Xiangya Hospital, Central South University, Changsha, Hunan, China
4. Department of Cardiovascular Medicine, The First Hospital of Changsha, Changsha, Hunan, China