1. Department of Obstetrics and Gynecology; China Meitan General Hospital; Beijing China
2. Department of Radiation Oncology; Peking University School of Oncology, Peking University Cancer Hospital; Beijing China
3. Pharmaceutical Preparation Section; China Meitan General Hospital; Beijing China
4. Department of Venereology; Wangjing Hospital, China Academy of Chinese Medical Sciences; Beijing China
5. Department of Obstetrics and Gynecology; Beijing Fengtai Hospital, Affiliated to Capital Medical University; Beijing China