1. Division of Cardiac Rehabilitation, Department of Physical Medicine & Rehabilitation, Xiangya Hospital of Central South University, Changsha, Hunan, China
2. National Clinical Research Centre for Geriatric Disorders, Xiangya Hospital of Central South University, Changsha, Hunan, China
3. Division of Preventive Cardiology, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN, USA
4. Cardiopulmonary Rehabilitation Centre, Taihe Hospital, Affiliated Hospital of Hubei University of Medicine, Shiyan, China
5. Department of Retirement Systems, State Grid Hunan Electric Power Company Limited, Changsha, Hunan, China