1. Department of Geriatric Cardiology; Chinese PLA General Hospital; Beijing China
2. Shijingshan Teaching Hospital of Capital Medical University; Beijing Shijingshan Hospital; Beijing China
3. Department of Cardiology; The Center Hospital of Zhoukou; Henan Province China
4. Department of Geriatrics; Civil Aviation General Hospital; Beijing China
5. The Health Department of Guard Bureau in the General Staff; Beijing China
6. Institute of Basic Medical Sciences; Academy of Military Medical Sciences; Beijing China
7. Beijing Institute of Radiation Medicine; Beijing China