1. Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan 250012, Shandong, China
2. National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan 250012, Shandong, China
3. Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan 250012, Shandong, China
4. Shandong Provincial Clinical Medicine Research Center for Reproductive Health, Shandong University, Jinan 250012, Shandong, China
5. Reproductive Hospital Affiliated to Shandong University, Jinan 250001, Shandong, China
6. Department of Andrology, Center for Men’s Health, Shanghai General Hospital; Department of ART, Institute of Urology, Urologic Medical Center, Shanghai General Hospital; Shanghai Key Lab of Reproductive Medicine; Shanghai Jiao Tong University School of Medicine, Shanghai 200080, China