1. State Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing, China
2. Department of Gynecology, Shijiazhuang People’s Hospital, Shijiazhuang, China
3. Department of Gynecology, Affiliated Hospital of Zunyi Medical University, Zunyi, China
4. Chongqing Haifu Hospital, Chongqing, China
5. Shijiazhuang Obstetrics and Gynecology Hospital, Shijiazhuang, China