1. Obstetrics and Gynecology, International Peace Maternity and Child Health Hospital, School of Medicine Shanghai Jiaotong University Shanghai China
2. Shanghai Key Laboratory of Embryo Original Disease Shanghai China
3. Shanghai Municipal Key Clinical Speciality Shanghai China
4. Department of Ultrasonic Image, International Peace Maternity and Child Health Hospital, School of Medicine Shanghai Jiaotong University Shanghai China
5. Obstetrics and Gynecology Zhejiang University School of Medicine Sir Run Run Shaw Hospital Hangzhou China