1. Department of Gynecology, Obstetrics and Gynecology Hospital of Fudan University, Shanghai, China.
2. Department of Obstetrics and Gynecology, West China Second University Hospital of Sichuan University, Chengdu, China.
3. Department of Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
4. Department of Gynecology, First Maternity and Infant Hospital Affiliated to Tongji University, Shanghai, China.
5. Department of Gynecology, Ganzhou People’s Hospital, Ganzhou, China.
6. Department of Gynecology, The Affiliated Ganzhou Hospital of Nanchang University, Ganzhou, China.
7. Department of Obstetrics and Gynecology, Shanghai Ninth People’s Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.