1. Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China
2. Department of Dermatology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
3. Peking University Center for Public Health and Epidemic Preparedness & Response, Beijing 100191, China
4. Fuwai Hospital Chinese Academy of Medical Sciences, Beijing 100730, China
5. Medical Research Council Population Health Research Unit at the University of Oxford, Oxford OX3 7LF, UK
6. Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, UK
7. Qingdao Center of Disease Control and Prevention, Qingdao, Shandong 266033, China
8. China National Center for Food Safety Risk Assessment, Beijing 100738, China.