1. Department of Epidemiology and Biostatistics, School of Public HealthPeking University Health Science CenterBeijing China
2. Chinese Academy of Medical SciencesBeijing China
3. Clinical Trial Service Unit & Epidemiological Studies Unit (CTSU), Nuffield Department of Population HealthUniversity of OxfordOxford United Kingdom
4. Hainan Center for Disease Control & PreventionHaikou Hainan China
5. Maiji Center for Disease Control & PreventionTianshui Gansu China
6. China National Center for Food Safety Risk AssessmentBeijing China
7. Peking University Institute of Environmental MedicineBeijing China