1. Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
2. Department of Gynecology, The Northwest Women’s and Children’s Hospital, Xi’an, Shaanxi, China
3. Department of Radiology, The First Affiliated Hospital of Xi’an Medical University, Xi’an, Shaanxi, China