1. School of Public Health and Family Medicine, Capital Medical University, Beijing, China.
2. Municipal Key Laboratory of Clinical Epidemiology, Beijing, China.
3. Beijing YouAn Hospital, Capital Medical University, Beijing, China.
4. College of Life Science, University of Chinese Academy of Sciences, Beijing, China.
5. Systems and Intervention Research Centre for Health, School of Medical Sciences, Edith Cowan University, Perth, Australia.