1. Key Laboratory of Major Obstetrics Diseases of Guangdong Province, Key Laboratory of Reproduction and Genetics of Guangdong Higher Education Institutes, The Third Hospital Affiliated to Guangzhou Medical University, Guangdong, China
2. State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
3. University of the Chinese Academy of Sciences, Beijing, China
4. State Key Laboratory of Biomembrane, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
5. Houston Fertility Institute/Houston Fertility Laboratory, Houston, Texas, USA