1 Dementia Research Centre (Y.T.H., J.D.W.), Department of Neurodegenerative Disease (A.G.B.T.), Department of Molecular Neuroscience (D.S.L., H.H.), UCL Institute of Neurology, and UCL Ear Institute (D.-E.B.), University College London; Lysholm Department of Neuroradiology (R.L., I.D.) and Department of Clinical and Experimental Epilepsy (S.H.E.), National Hospital for Neurology and Neurosurgery, London; and Department of Neurology (N.B.), Queen's Medical Centre, Nottingham, United Kingdom.