1. Key Laboratory of Fertility Regulation Department of Obstetrics and Gynaecology The University of Hong Kong – Shenzhen Hospital Shenzhen China
2. Department of Obstetrics and Gynaecology Queen Mary Hospital The University of Hong Kong Hong Kong Hong Kong
3. The Family Planning Association of Hong Kong Hong Kong Hong Kong
4. Department of Obstetrics and Gynecology Peking University Third Hospital Beijing China
5. Department of Family Medicine and Primary Care The University of Hong Kong Hong Kong Hong Kong
6. Department of Pathology Queen Mary Hospital The University of Hong Kong Hong Kong Hong Kong
7. Department of Medicine Queen Mary Hospital The University of Hong Kong Hong Kong Hong Kong
8. Reproductive Medicine Center People's Liberation Army General Hospital Beijing China
9. School of Public Health The University of Hong Kong Hong Kong Hong Kong