1. Clinical Trial Service Unit & Epidemiological Studies Unit, Nuffield Department of Population HealthUniversity of Oxford Oxford UK
2. Medical Research Council Population Health Research Unit, Nuffield Department of Population HealthUniversity of Oxford Oxford UK
3. Chinese Academy of Medical Sciences Beijing China
4. Qingdao Cancer Hospital QingdaoChina
5. Yongqinglu Community Health Service Center Qingdao China
6. Qingdao Center for Disease Prevention and Control Qingdao China
7. National Center for Food Safety Risk Assessment Beijing China
8. School of Public HealthPeking University
9. National Institute for Health Research Oxford Biomedical Research CentreOxford University Hospital Oxford UK