1 Reproductive Medical Center of Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, 197 Ruijin 2nd Road, Shanghai 200025, China.
2 Department of Obstetrics and Gynaecology, BC Children's Hospital Research Institute, University of British Columbia, Room 317, 950 West 28 Avenue, Vancouver, British Columbia, Canada V5Z 4H4.
3 Shanghai Key Laboratory of Reproductive Medicine, 280 South Chongqing Road, Shanghai 200025, China.