1. Department of Assisted Reproduction; Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
2. Center for Reproductive Medicine; Renji Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
3. Department of Gynecology and Obstetrics; Renji Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
4. Department of Gynecology, Obstetrics and Gynecology Hospital of Fudan University; Shanghai China