1. From the Department of Neurology (E.J., S.F.K.L., F.J., D.P.K., A.B.), Royal Free Hospital NHS Foundation Trust; The National Hospital for Neurology and Neurosurgery (E.J., F.J., H.M., A.B.), University College London Hospitals NHS Foundation Trust; and Division of Neuropathology (F.R., S.B.), UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, United Kingdom.