1. Department of Gynecologic and Obstetrics, The First Affiliated Hospital, College of Clinical Medicine, Henan University of Science and Technology, Luoyang 471000, Henan, China
2. Department of Gynecologic and Obstetrics, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan, China
3. Department of Gastrointestinal Tumor Surgery, The First Affiliated Hospital, College of Clinical Medicine, Henan University of Science and Technology, Luoyang 471000, Henan,China
4. University Hospital, Henan University of Science and Technology, Luoyang 471000, Henan, China