1. Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, South Carolina.
2. Department of Preventive Medicine, School of Public Health, Nanjing Medical University, Nanjing, China.
3. Key Laboratory of Public Health Safety, Ministry of Education, Institution for Water Pollution and Health Research, Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China.
4. Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.
5. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Xiamen University, Xiamen, China.