1. Department of Obstetrics; University of Groningen, University Medical Center Groningen; Groningen The Netherlands
2. Department of Obstetrics; University Medical Center Amsterdam; Amsterdam The Netherlands
3. Department of Obstetrics; Isala Klinieken; Zwolle The Netherlands
4. Department of Neurology; University of Groningen, University Medical Center Groningen; Groningen The Netherlands
5. Eurocat, Department of Genetics; University Medical Center Groningen, University of Groningen; Groningen The Netherlands