1. Department of Genetics, Center for Molecular Medicine University Medical Center Utrecht, Utrecht University Utrecht The Netherlands
2. Department of Clinical Genetics Amsterdam University Medical Centers Amsterdam The Netherlands
3. Division of Genetics and Genomic Medicine, Department of Pediatrics Washington University School of Medicine St. Louis Missouri USA
4. Division of Pediatric Neurology, Department of Neurology Washington University School of Medicine St. Louis Missouri USA
5. Division of Pediatric Critical Care, Department of Pediatrics Washington University School of Medicine St. Louis Missouri USA
6. Department of Genetics University Medical Center Groningen Groningen The Netherlands
7. Center for the Investigation of Membrane Excitability Diseases (CIMED) St. Louis Missouri USA
8. Department of Clinical Genetics VU Medical Center, Amsterdam University Medical Centers Amsterdam The Netherlands