1. Center for Reproductive MedicineRen Ji HospitalSchool of MedicineShanghai Jiao Tong University Shanghai China
2. Shanghai Key Laboratory for Assisted Reproduction and Reproductive Genetics Shanghai China
3. Department of Obstetrics and GynecologyRen Ji HospitalSchool of MedicineShanghai Jiao Tong University Shanghai China
4. Department of Obstetrics and GynecologyOregon Health and Science University Portland Oregon USA