1. Department of Obstetrics and Gynecology; University of California San Diego; La Jolla California USA
2. Department of Obstetrics and Gynaecology; Amsterdam University Medical Centers; Amsterdam Netherlands
3. Department of Obstetrics and Gynaecology; Monash University; Clayton Australia
4. Obstetrics and Gynaecology; Radboudumc; Nijmegen Netherlands
5. Obstetrics & Gynaecology, College of Medicine and Public Health; Flinders University; Adelaide Australia
6. Department of Obstetrics and Gynecology; Rijnstate Hospital; Arnhem Netherlands
7. Obstetrics and Gynaecology; Amsterdam University Medical Centers; Amsterdam Netherlands