1. Department of Obstetrics, Gynaecology and Prenatal Diagnosis, University Medical Centre Groningen; University of Groningen; Groningen The Netherlands
2. Department of Obstetrics, Gynaecology and Prenatal Diagnosis; Leiden University Medical Centre; Leiden The Netherlands
3. Department of Obstetrics, Gynaecology and Prenatal Diagnosis; Erasmus MC University Medical Centre; Rotterdam The Netherlands
4. Department of Obstetrics and Gynaecology; Academic Medical Centre; Amsterdam The Netherlands
5. Department of Obstetrics, Gynaecology and Prenatal Diagnosis; Radboud University Medical Centre; Nijmegen The Netherlands
6. Department of Obstetrics, Gynaecology and Prenatal Diagnosis; Utrecht University Medical Centre; Utrecht The Netherlands
7. Department of Obstetrics, Gynaecology and Prenatal Diagnosis, University Medical Centre; Grow School for Oncology and Medical Biology; Maastricht The Netherlands
8. Department of Obstetrics, Gynaecology and Prenatal Diagnosis; VU University Medical Centre; Amsterdam The Netherlands