1. Department of Gynecology and Obstetrics, International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
2. Shanghai Key Laboratory of Embryo Original Diseases, Shanghai, China
3. Shanghai Municipal Key Clinical Specialty, Shanghai, China
4. Department of Ultrasound, International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China