1. Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University , Jinan, Shandong , China
2. Key laboratory of Reproductive Endocrinology of Ministry of Education, National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong Provincial Clinical Medicine Research Center for Reproductive Health , Jinan, Shandong , China
3. State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences , Beijing , China
4. Beijing Institute for Stem Cell and Regenerative Medicine , Beijing , China
5. Shanghai Key Laboratory for Assisted Reproduction and Reproductive Genetics , Shanghai , China
6. Center for Reproductive Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University , Shanghai , China