1. Center for Pediatric and Adolescent Medicine, Division of Pediatric Neurology and Metabolic MedicineUniversity Hospital Heidelberg Heidelberg Germany
2. Children's National Health System and George Washington School of Medicine Washington DC
3. Department of Molecular and Human GeneticsBaylor College of Medicine and Texas Children's Hospital Houston TX
4. Center for Human Genetics and Department of Genetics and Genome SciencesUniversity Hospitals Cleveland Medical Center and Case Western Reserve University Cleveland OH
5. David Geffen School of Medicine at University of California, Los Angeles Los Angeles CA
6. Harvard Medical School and Boston Children's Hospital Boston MA
7. University Children's Hospital Zurich and Children's Research Center Zurich Switzerland
8. University of Pennsylvania School of Medicine and Children's Hospital of Philadelphia Philadelphia PA
9. Heidelberg Research Center for Molecular Medicine Heidelberg Germany
10. Hospital for Sick Children and University of Toronto Toronto Ontario Canada
11. Children's Hospital Colorado and University of ColoradoSchool of Medicine Aurora CO
12. Hospital San Joan de DeuInstitut Pediàtric de Recerca. Servicio de Neurologia and CIBERER, ISCIII Barcelona Spain