Maarten J Titulaer1, Josep Dalmau. 1. From the Department of Neurology (M.J.T.), Erasmus Medical Center, Rotterdam, the Netherlands; Service of Neurology at Hospital Clinic (J.D.), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Department of Neurology (J.D.), University of Pennsylvania, Philadelphia; and Institució Catalana de Recerca i Estudis Avançats (ICREA) (J.D.), Barcelona, Spain.