1. Department of Neurology Johns Hopkins University School of Medicine Baltimore MD USA
2. Kennedy Krieger Institute Baltimore MD USA
3. Department of Neurology, David Geffen School of Medicine University of California Los Angeles CA USA
4. Departments of Neurology and Pediatrics University of California San Francisco CA USA
5. Department of Neurology, Perelman School of Medicine University of Pennsylvania Philadelphia PA USA
6. Departments of Neurology and Pediatrics University of Southern California Keck School of Medicine Los Angeles CA USA
7. Department of Pediatrics, Division of Pediatric Neurology Vanderbilt University Medical Center Nashville TN USA
8. Department of Neurology Harvard Medical School Boston MA USA