1. Departments of Ultrasound Diagnostics, the International Peace Maternity and Child Health Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
2. Shanghai Key Laboratory of Embryo Original Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai, China
3. Departments of Ultrasound Diagnostics, Shanghai Key Laboratory of Maternal Fetal Medicine, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, China