1. From the Queen Square Brain Bank for Neurological Disorders (A.H., P.C., S.W., T.R., Z.J., T.T.W., E.D.P.-F.) and Department of Clinical and Movement Neurosciences (H.R.M.), University College London Queen Square Institute of Neurology; and Institute of Nuclear Medicine (J.C.D.), University College London Hospitals NHS Trust, UK.