1. Department of Obstetrics and Gynecology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
2. Department of Obstetrics and Gynecology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China
3. R&D Department, Shandong Qilu Cell Therapy Engineering Technology Co., Ltd., Jinan, Shandong 25000, P.R. China
4. Department of Surgery, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R. China