1. Department of Gynecology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China (mainland)
2. Department of Radiology, Civil Aviation General Hospital, Civil Aviation Clinical Medical College of Peking University, Beijing, China (mainland)
3. Department of Radiology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China (mainland)