1. Center for Reproductive Medicine Cheeloo College of Medicine, Shandong University Jinan China
2. National Research Center for Assisted Reproductive Technology and Reproductive Genetics Shandong University Jinan China
3. Key Laboratory of Reproductive Endocrinology of Ministry of Education Shandong University Jinan China
4. Shandong Provincial Clinical Medicine Research Center for Reproductive Health Shandong University Jinan China
5. School of Medicine Shandong University Jinan China
6. Department of Obstetrics and Gynecology Qilu Hospital of Shandong University Jinan China
7. Department of Obstetrics and Gynaecology BC Children’s Hospital Research Institute, University of British Columbia Vancouver BC Canada