Tipu Z Aziz1, Marwan Hariz2. 1. From the Nuffield Department of Surgical Sciences (T.Z.A.), University of Oxford, John Radcliffe Hospital, Headington; Unit of Functional Neurosurgery (M.H.), UCL Institute of Neurology, London, UK; and Department of Clinical Neuroscience (M.H.), Umeå University, Sweden. tipu.aziz@nds.ox.ac.uk. 2. From the Nuffield Department of Surgical Sciences (T.Z.A.), University of Oxford, John Radcliffe Hospital, Headington; Unit of Functional Neurosurgery (M.H.), UCL Institute of Neurology, London, UK; and Department of Clinical Neuroscience (M.H.), Umeå University, Sweden.