1. Division of Neurology, Department of Paediatrics,
2. Bloorview Epilepsy Research Program, Toronto, Ontario, Canada; and
3. Department of Diagnostic Imaging,
4. Division of Neurosurgery, Department of Surgery, and
5. Department of Pathology, The Hospital for Sick Children, University of Toronto, and
6. Departments of Neurology and
7. Radiology, Scripps Clinic, San Diego, California, U.S.A.