1. Department of Gynecology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221000 Jiangsu, China
2. Xuzhou Medical University, Xuzhou, 221000 Jiangsu, China
3. Department of Obstetrics, Jinhu County People’s Hospital, Huai’an, 223000 Jiangsu, China
4. Department of Oncology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221000 Jiangsu, China