1. Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
2. Department of Geriatric Cardiology, Chinese People's Liberation Army General Hospital, Beijing, China
3. China Center for Health Development Studies, Peking University, Beijing, China
4. Department of Rehabilitation, Zhengzhou Central Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan, China
5. School of Life Science, Beijing Institute of Technology, Beijing, China