1 From Hospital Clinic-IDIBAPS (J.D.), University of Barcelona; Catalan Institution for Research and Advanced Studies (ICREA) (J.D.), Barcelona, Spain; Department of Neurology (J.D.), University of Pennsylvania, Philadelphia; and Nuffield Department of Clinical Neurosciences (A.V.), John Radcliffe Hospital, University of Oxford, UK. Jdalmau@clinic.ub.es angela.vincent@ndcn.ox.ac.uk.