1. Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China
2. Key Laboratory of Epidemiology of Major Diseases (Peking University), Ministry of Education, Beijing 100191, China
3. Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, China
4. Fujian Provincial Center for Disease Control and Prevention, Fuzhou 350012, China
5. Department of Hygiene, Nanjing Country Center for Disease Control and Prevention, Nanjing 363600, China
6. Key Laboratory of Reproductive Health, Ministry of Health, Beijing 100191, China
7. Center for Public Health and Epidemic Preparedness & Response, Peking University, Beijing 100191, China