1. Department of Ultrasound, Xianxian Hospital of TCM, Xianxian, China
2. Department of Gynecology and Obstetrics, Xianxian Hospital of TCM, Xianxian, China
3. Department of Gynecology and Obstetrics, Mengcun Hui Autonomous County Hospital, Cangzhou, China
4. Department of Gynecology, Shijiazhuang Changcheng Hospital of Integrated Traditional Chinese and Western Medicine, Shijiazhuang, China