1. Servei de Neurologia-Neuroimmunologia, Centre d’Esclerosi Múltiple de Catalunya (Cemcat), Hospital Universitario Vall d’Hebron, Barcelona, Spain
2. Servei de Neurologia-Neuroimmunologia, Centre d’Esclerosi Múltiple de Catalunya (Cemcat), Hospital Universitario Vall d’Hebron, Edif. Antiga EUI, Pl 2, Barcelona, 08035, SpainDivision of Neurology, University of Toronto, 190 Elizabet Street R. Fraser Elliott Building, 3-805, Toronto, ON, Canada