1. Department of Neurology; University of Pennsylvania, Perelman School of Medicine; Philadelphia PA USA
2. Division of Neurology; Children's Hospital of Philadelphia; Philadelphia PA USA
3. Departments of Neurology and Pediatrics; University of California San Francisco (UCSF); San Francisco CA USA
4. Department of Pediatrics; University of Cincinnati, College of Medicine; Cincinnati OH USA
5. Division of Neurology; Cincinnati Children's Hospital Medical Center; Cincinnati OH USA