1. Center for Reproductive Medicine, Department of Obstetrics and Gynaecology Peking University Third Hospital Beijing China
2. National Clinical Research Center for Obstetrics and Gynaecology Beijing China
3. Key Laboratory of Assisted Reproduction (Peking University) Ministry of Education Beijing China
4. Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology Beijing China
5. Unimed Biotech (Shanghai) Co., Ltd. Shanghai China