1. Departments of Neurology and Pediatrics; The Children's Hospital of Philadelphia and the Perelman School of Medicine at the University of Pennsylvania; Pennsylvania Philadelphia U.S.A
2. Departments of Pediatrics and Neurology; Oakland University William Beaumont School of Medicine; Royal Oak Michigan U.S.A
3. Department of Neurology; Children's National Medical Center; Washington District of Columbia U.S.A
4. Division of Neurology; Children's Hospital Colorado and University of Colorado School of Medicine; Aurora Colorado U.S.A
5. Division of Neurology; Duke Children's Hospital and Duke University School of Medicine; Durham North Carolina U.S.A
6. Division of Neurology; Department of Pediatrics Mattel Children's Hospital and UCLA Brain Injury Research Center; Department of Neurosurgery; David Geffen School of Medicine at UCLA; Los Angeles California U.S.A
7. Division of Neurology; Children's Memorial Hospital and Northwestern University Feinberg School of Medicine; Chicago Illinois U.S.A
8. Division of Neurology; The Hospital for Sick Children and University of Toronto; Toronto Ontario Canada
9. Division of Epilepsy and Clinical Neurophysiology; Department of Neurology; Boston Children's Hospital and Harvard Medical School; Boston Massachusetts U.S.A
10. Department of Neurology; University of California San Francisco; San Francisco California U.S.A
11. Department of Biostatistics and Epidemiology; Center for Clinical Epidemiology and Biostatistics; Perelman School of Medicine at the University of Pennsylvania; Pennsylvania Philadelphia U.S.A
12. Department of Pediatrics; University of Arizona College of Medicine and Barrow's Neurological Institute at Phoenix Children's Hospital; Phoenix Arizona U.S.A