1. Department of Obstetrics Women's Hospital, Zhejiang University School of Medicine Hangzhou China
2. Department of Radiology Women's Hospital, Zhejiang University School of Medicine Hangzhou China
3. Reproductive Medicine Center the Fourth Affiliated Hospital, Zhejiang University School of Medicine Yiwu China
4. Department of Obstetrics the Fourth Affiliated Hospital, Zhejiang University School of Medicine Yiwu China