1 Department of Gynecology, Women's Hospital, Zhejiang University School of Medicine (all authors), and; Department of Gynecology, Hangzhou Women's Hospital (Dr. Zhu), Hangzhou, China.
2 Department of Gynecology, Women's Hospital, Zhejiang University School of Medicine (all authors), and.
3 Department of Gynecology, Women's Hospital, Zhejiang University School of Medicine (all authors), and. Electronic address: yangxinyun@zju.edu.cn.