1. Department of Obstetrics and Gynecology; VU Medical Center; Amsterdam The Netherlands
2. Department of Obstetrics and Gynecology; University Medical Center Groningen; Groningen The Netherlands
3. Department of Obstetrics and Gynecology; University Medical Center Utrecht; Utrecht The Netherlands
4. Department of Obstetrics and Gynecology; Academic Medical Center; Amsterdam The Netherlands
5. Department of Obstetrics and Gynecology; Erasmus Medical Center Rotterdam; Rotterdam The Netherlands
6. Department of Obstetrics and Gynecology; Radboud University Medical Center Nijmegen; Nijmegen The Netherlands
7. Department of Obstetrics and Gynecology; Maxima Medical Center Veldhoven; Veldhoven The Netherlands
8. Department of Obstetrics and Gynecology; Maastricht Medical Center; Maastricht The Netherlands
9. Department of Obstetrics and Gynecology; Isala Zwolle; Zwolle The Netherlands
10. Department of Obstetrics and Gynecology; Leiden University Medical Center; Leiden The Netherlands