1. Department of Obstetrics, Gynecology and Prenatal DiagnosisUniversity Medical Center Groningen, University of Groningen Groningen The Netherlands
2. Department of ObstetricsLeiden University Medical Center Leiden The Netherlands
3. Department of Obstetrics and GynecologyDivision of Obstetrics and Prenatal Medicine, Erasmus MC University Medical Center Rotterdam The Netherlands
4. Department of Obstetrics and GynecologyAcademic Medical Center Amsterdam Amsterdam The Netherlands
5. Department of Obstetrics, Gynecology and Prenatal DiagnosisRadboud University Medical Center Nijmegen The Netherlands
6. Department of Obstetrics, Gynecology and Prenatal DiagnosisUniversity Medical Center Utrecht Utrecht The Netherlands
7. Department of Obstetrics, Gynecology and Prenatal DiagnosisUniversity Medical Center, Grow School for Oncology and Medical Biology Maastricht The Netherlands
8. Department of Obstetrics, Gynecology and Prenatal DiagnosisVU University Medical Center Amsterdam The Netherlands