1. Department of Maternal and Child Health and MOE (Ministry of Education) Key Laboratory of Environment and HealthSchool of Public Health, Tongji Medical College, Huazhong University of Science and Technology Wuhan China
2. Hangzhou Center for Disease Control and Prevention Hangzhou China
3. Department of Epidemiology and BiostatisticsArnold School of Public Health, University of South Carolina Columbia South Carolina
4. Department of Women's and Children's HealthDunedin School of Medicine, University of Otago Dunedin New Zealand