1. Center for Reproductive Medicine The First Affiliated Hospital of Zhengzhou University Zhengzhou China
2. Department of Obstetrics and Gynaecology BC Children's Hospital Research InstituteUniversity of British Columbia Vancouver BC Canada
3. Henan Key Laboratory of Reproduction and Genetics The First Affiliated Hospital of Zhengzhou University Zhengzhou China
4. Henan Provincial Obstetrical and Gynecological Diseases (Reproductive Medicine) Clinical Research Center, The First Affiliated Hospital of Zhengzhou University Zhengzhou China