1. Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China
2. National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, Shandong 250012, China
3. Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, Shandong 250012, China
4. Shandong Provincial Clinical Medicine Research Center for Reproductive Health, Shandong University, Jinan, Shandong 250012, China
5. Shanghai Key Laboratory for Assisted Reproduction and Reproductive Genetics, Shanghai 200000, China