1. Department of Obstetrics and Gynaecology, The University of Hong Kong, Queen Mary Hospital, Pokfulam Road, Hong Kong, Hong Kong SAR
2. Centre of Reproduction, Development and Growth, The University of Hong Kong, Queen Mary Hospital, Pokfulam Road, Hong Kong, Hong Kong SAR
3. Shenzhen Key Laboratory of Fertility Regulation, Department of Obstetrics and Gynecology, The University of Hong Kong-Shenzhen Hospital, Shenzhen, Hong Kong SAR, P.R. China
4. The Sixth Affiliated Hospital of Sun Yat-Sen University, 26 Erheng Road, Guangzhou, P.R. China
5. Center for Reproductive Medicine, The Third Affiliated Hospital, Sun Yat-Sen University, 600, Tianhe Road, Guangzhou, P.R. China