1. Department of Obstetrics, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China (mainland)
2. Department of Radiology, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China (mainland)
3. Ultrasonic Department, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China (mainland)