1. State Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China
2. Chongqing Key Laboratory of Biomedical Engineering, Chongqing Medical University, Chongqing, China
3. Yongchuan Maternal and Child Health Care Hospital of Chongqing, Chongqing, China
4. Department of Surgery, Huanggang Central Hospital, Huanggang City, China
5. Department of Gynecology, Chongqing Haifu Hospital, Chongqing, China