1. Division of Cardiac Rehabilitation, Department of Physical Medicine & Rehabilitation, Xiangya Hospital of Central South University, Changsha, China
2. National Clinical Research Centre for Geriatric Disorders, Xiangya Hospital of Central South University, Changsha, China
3. Division of Preventive Cardiology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
4. The First Hospital of Changsha, Changsha, China
5. Department of Neurology, Xiangya Hospital of Central South University, Changsha, China