1. Department of Clinical Genetics; VU University Medical Centre; Amsterdam; The Netherlands
2. Department of Medical Genetics; University Medical Centre Utrecht; Utrecht; The Netherlands
3. Department of Genetics; University Medical Centre Groningen; Groningen; The Netherlands
4. Department of Clinical Genetics; Erasmus Medical Centre; Rotterdam; The Netherlands
5. Department of Clinical Genetics; Academic Medical Centre; Amsterdam; The Netherlands
6. Department of Clinical Genetics; Leiden University Medical Centre; Leiden; The Netherlands
7. Department of Clinical Genetics; University Medical Centre Maastricht; Maastricht; The Netherlands
8. Department of Human Genetics; Radboud University Nijmegen Medical Centre; Nijmegen; The Netherlands