1. Department of Obstetrics and Gynaecology, University Medical Center GroningenUniversity of Groningen Groningen the Netherlands
2. Department of Clinical Genetics. University Medical Center GroningenUniversity of Groningen Groningen the Netherlands
3. Department of Obstetrics and GynaecologyErasmus Medical Center Rotterdam Rotterdam the Netherlands
4. Department of Obstetrics and GynaecologyUniversity Medical Center Leiden Leiden the Netherlands
5. Department of Obstetrics and GynaecologyUniversity Medical Center Utrecht Utrecht the Netherlands
6. Department of Obstetrics and GynaecologyRadboud University Medical Centre Nijmegen Nijmegen the Netherlands
7. Department of Obstetrics and GynaecologyMaastricht University Medical Center Maastricht the Netherlands
8. Department of Obstetrics and GynecologyAmsterdam University Medical Centers, location AMC Amsterdam the Netherlands
9. Department of Obstetrics and GynecologyAmsterdam University Medical Centers, location VUmc Amsterdam the Netherlands