1. State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
2. University of Chinese Academy of Sciences, Savaid Medical School, Beijing, China
3. Center for Reproductive Medicine, Peking University Third Hospital, Beijing, China
4. Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China