1. Departments of Pediatrics and Neurology, Children’s Hospital of Philadelphia, Philadelphia, PA, USA
2. Department of Neurology, University of California, Los Angeles, Los Angeles, CA, USA
3. Department of Neurology, Emory University, Atlanta, GA, USA
4. Department of Neurology, University of Chicago, Chicago, IL, USA
5. Department of Neurology, University of Iowa, Iowa City, IA, USA
6. Division of Clinical and Metabolic Genetics, Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
7. Department of Neurology, University of South Florida, and the James A. Haley Veterans’ Administration Hospital, Tampa, FL, USA
8. Department of Neurology, Ohio State University, Columbus, OH, USA
9. Department of Neurology, University of Florida, Gainesville, FL, USA
10. Murdoch Children’s Research Institute, Melbourne, Australia
11. Department of Neurology, University of Rochester, Rochester, NY, USA
12. Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA