1. Departments of Obstetrics and Gynecology
2. School of Public Health, The University of Hong Kong, Hong Kong SAR, China
3. School of Public Health, Brown University, Providence, RI
4. Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
5. Department of Obstetrics and Gynecology, Affiliated Hospital of Inner Mongolia Medical University, Huhhot, China
6. Department of Obstetrics and Gynecology, Affiliated Tumor Hospital of Guangxi Medical University, Nanning, China
7. Department of Gynecologic Oncology, Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
8. Pathology, Second Hospital of Shanxi Medical University, Taiyuan, Shanxi, China