1. Department of Obstetrics and Gynecology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, People's Republic of China
2. School of Control Science and Engineering, Shandong University, Jinan, Shandong, People's Republic of China
3. Department of Obstetrics and Gynecology, Jining No.1 People's Hospital, Jining, Shandong, People's Republic of China
4. Gynecology Oncology Key Laboratory, Qilu Hospital, Shandong University, Jinan, Shandong, People's Republic of China