1. Department of Pediatrics; University of Arkansas for Medical Sciences; Little Rock Arkansas U.S.A
2. Department of Pediatrics; Sackler School of Medicine; Tel Hashomer Israel
3. Department of Neurology; Maastricht University Medical Center; Maastricht The Netherlands
4. Center for Rare Diseases; Department of Clinical Genetics; University Hospital Copenhagen; Copenhagen Denmark
5. Departments of Pediatrics and Neurobiology; Duke University Medical Center; Durham North Carolina U.S.A
6. Departments of Neurology, Neuroscience, and Molecular and Human Genetics; Baylor College of Medicine; Houston Texas U.S.A
7. Department of Human Genetics; Donders Institute for Brain, Cognition and Behavior; Radboud University Medical Center; Nijmegen The Netherlands
8. Department of Pediatrics; University of Colorado; Aurora Colorado U.S.A
9. Departments of Pediatrics and Neurology; Boston Children's Hospital; Boston Massachusetts U.S.A
10. Royal Children's Hospital; Melbourne Victoria Australia
11. Department of Neuroscience; University of Naples Federico II; Naples Italy
12. Department of Medicine and Health Sciences; University of Molise; Campobasso Italy
13. Protestant Hospital Bielefeld; Bielefeld Germany
14. Neurogenetics Group; Department of Molecular Genetics; VIB; Antwerp Belgium
15. Laboratory of Neurogenetics; Institute Born-Bunge; University of Antwerp; Antwerp Belgium
16. Department of Neurology; University Hospital Antwerp; Antwerp Belgium
17. Departments of Neurology and Pediatrics; University of California San Francisco; San Francisco California U.S.A