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.