1. Key Laboratory of Animal Resistance Research, College of Life Science, Shandong Normal University, Shandong 250014, China
2. Department of Gynecology and Obstetrics, Ji’nan Maternity and Child Care Hospital, Shandong 250001, China
3. Center for Reproductive Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200135, China
4. Shanghai Key Laboratory for Assisted Reproduction and Reproductive Genetics, Shanghai 200135, China