1. Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, China
2. Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing, China
3. Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproduction, Beijing, China
4. State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
5. Key Laboratory for Major Obstetric Diseases of Guangdong Province, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
6. Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China