1. Department of Obstetrics and Gynaecology The Chinese University of Hong Kong Hong Kong SAR
2. Department of Obstetrics and Gynecology Peking University First Hospital Beijing China
3. Department of Gynaecology and Obstetrics University Hospitals Leuven, Leuven, Belgium; and Department of Gynaecology AZ Delta, Roeselare Belgium
4. Division of Obstetrics and Gynaecology KK Women's and Children's Hospital Singapore
5. Department of Obstetrics, Gynecology & Reproductive Sciences Yale School of Medicine New Haven CT USA
6. Department of Gynaecology, AZ Delta Roeselare Belgium
7. Department of Obstetrics and Gynaecology Royal Free Teaching Hospital Foundation Trust London UK
8. Department of Gynecology and Obstetrics, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil; and Department of Obstetrics and Gynaecology Monash University Melbourne Australia
9. Department of Obstetrics and Gynaecology Zhongnan Hospital of Wuhan University Wuhan China
10. Department of Obstetrics and Gynaecology The Third Affiliated Hospital of Guangzhou Medical University Guangzhou China
11. Department of Clinical and Experimental Sciences University of Brescia Brescia Italy