1. Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU) Nuffield Department of Population Health University of Oxford UK
2. Department of Public Health Beijing University BeijingChina
3. Chinese Academy of Medical Sciences Beijing China
4. China National Center for Food Safety Risk Assessment Beijing China
5. Suzhou Centre for Disease Control and Prevention Suzhou China
6. Nangang Centre for Disease Control and Prevention Harbin China
7. Liuyang Centre for Disease Control and Prevention Liuyang China
8. Maiji Centre for Disease Control and Prevention Tianshui China
9. Pengzhou Centre for Disease Control and Prevention Pengzhou China