1. Department of Clinical Genetics; Erasmus Medical Center; Rotterdam The Netherlands
2. Department of Obstetrics and Gynecology; Erasmus Medical Center; Rotterdam The Netherlands
3. Foundation Prenatal Screening Southwest region of the Netherlands; Rotterdam The Netherlands
4. Department of Obstetrics and Gynecology; Amphia Hospital; Breda The Netherlands
5. Department of Obstetrics and Gynecology; Reinier de Graaf Gasthuis; Delft The Netherlands
6. Department of Gynecology; Albert Schweitzer Hospital Dordrecht; Dordrecht The Netherlands