Affiliation: | Research Fellow, S.D. Shorvon, MD, MRCP, Reader in Neurology, Epilepsy Research Group, University Department of Clinical Neurology, Institute of Neurology, Queen Square, London WON 3BG;Consultant Neurophysiologist, Department of Clinical Neurophysiology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N3BG |