1. Department of Gynecology, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, China
2. Department of Neurosurgery, Renji Hospital, School of Medicine, Shanghai Jiao-Tong University, Shanghai, China
3. Central Laboratory, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, China
4. Department of Pathology, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, China
5. Department of Gynecology and Obstetrics, Xinhua Hospital, Affiliated with Shanghai Jiao Tong University, School of Medicine, Shanghai, China
6. Department of Obstetrics and Gynecology, Renji Hospital Affiliated to Shanghai Jiao Tong University School of Medcine, Shanghai, China