1. Center for Reproductive Medicine; Provincial Hospital Affiliated to Shandong University; Jinan China
2. Key Laboratory for Reproductive Endocrinology of Ministry of Education; Jinan China
3. Shandong Provincial Key Laboratory of Reproductive Medicine; Jinan China
4. National Research Center for Assisted Reproductive Technology and Reproductive Genetics; Jinan China
5. Department of Biological Sciences; University of Notre Dame; Notre Dame Indiana USA
6. The Warren Alpert Medical School; Brown University; Providence Rhode Island USA
7. Center for Reproductive Medicine; Ren Ji Hospital; School of Medicine; Shanghai Jiao Tong University; Shanghai China. Shanghai Key Laboratory for Assisted Reproduction and Reproductive Genetics; Shanghai China