1. National Center for Women and Children’s Health, Chinese Center for Disease Control and Prevention, Beijing, China
2. Department of Maternal and Child Health and MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
3. National Health Commission of the People’s Republic of China, Beijing, China
4. Health, Nutrition & WASH Section of UNICEF China Office, Beijing, China
5. Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, NC, USA