1. Department of Obstetrics and Gynaecology, Assisted Reproductive Technology Unit, The Chinese University of Hong Kong, Hong Kong, PR China
2. Department of Obstetrics and Gynaecology, Shenzhen Baoan Women’s and Children’s Hospital, Shenzhen University, Shenzhen, PR China
3. Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong, PR China