1. Department of Maternal, Child, and Adolescent Health, School of Public Health, Anhui Medical University, Hefei, China
2. Anhui Provincial Key Laboratory of Population Health and Aristogenics, Hefei, China
3. School of Public Health and Institute of Health and Biomedical Innovation, Queensland University of Technology, Kelvin Grove, Australia
4. Department of Gynecology and Obstetrics, Hefei First People's Hospital, Hefei, China
5. Department of Gynecology and Obstetrics, Hefei Maternal and Child Health Hospital, Hefei, China