1. Department of Child Neurology, VU University Medical Center, Amsterdam, The Netherlands
2. Department of Child Neurology, Sophia Children's Hospital, Erasmus University Medical Center, Rotterdam, The Netherlands
3. Department of Medical Genetics, School of Medicine, Princess Anne Hospital, University of Southampton, Southampton, United Kingdom
4. Department of Pediatrics and Pediatric Neurology, Georg August University, Göttingen, Germany
5. Department of Pediatric Neurology, Hospital de Faro, Faro, Portugal
6. Department of Pediatrics, Kinderzentrum München, München, Germany
7. Department of Pediatrics, Children's Clinic of Tartu, University Hospital, Tartu, Estonia
8. Department of Genetics, Children's Hospital, University of Missouri Health Care, Columbia, Missouri, United States
9. Department of Paediatric Neurology, Great Ormond Street Hospital for Children, London, United Kingdom
10. Department of Child Neurology, National Institute for Neurology “Carlo Besta,” Milan, Italy
11. Division of Clinical and Metabolic Genetics, Hospital for Sick Children, Toronto, Canada
12. Division of Pediatric Neuroradiology, Hospital for Sick Children, Toronto, Canada