1. Division of Neurosurgery, Neurosciences Department, King Faisal Specialist Hospital & Research Center, Riyadh 11211, Saudi Arabia
2. Division of Neurological Surgery, Faculty of Medicine, King Abdulaziz University, P.O. Box 1540, Jeddah, Saudi Arabia
3. Epilepsy Programme, Department of Clinical Neurological Sciences, University of Western Ontario, London, ON, Canada N6A 5A5