1. Department of Gynecology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, 221000 Jiangsu, China
2. Graduate School, Xuzhou Medical University, Xuzhou, Jiangsu 221000, China
3. Department of Gynecology, Maternal and Child Health Care Hospital Affiliated to Xuzhou Medical University, Xuzhou, 221000 Jiangsu, China
4. Department of Gynecology, Huangshi Love & Health Hospital Affiliated to Hubei Polytechnic University, Huangshi, 435000 Hubei, China