1. Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
2. Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environment and Health (incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
3. Department of Gynecology and Obstetrics, Wuhan No.1 Hospital, Wuhan, Hubei, PR China
4. Department of Gynecology and Obstetrics, Xiaonan Maternal and Child Care Service Centre, Xiaogan, Hubei, PR China