1. Department of Child Neurology, VU University Medical Centre, Amsterdam, The Netherlands
2. Department of Neurogenetics, Kennedy Krieger Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States
3. Department of Neurology, Children's National Health System, Washington, District of Columbia, United States
4. Institute of Metabolic Disease, Baylor Research Institute, Dallas, Texas, United States
5. Division of Neuroradiology, The Hospital for Sick Children, Toronto, Ontario, Canada