1 From the Queen Square Multiple Sclerosis Centre (A.T.T.), Department of Neuroinflammation, Queen Square UCL Institute of Neurology, University College London, United Kingdom; and Servicio de Neurología (A.V.-J.), Centro de Esclerosis Múltiple de Catalunya (Cemcat), Hospital Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Spain. a.toosy@ucl.ac.uk.
2 From the Queen Square Multiple Sclerosis Centre (A.T.T.), Department of Neuroinflammation, Queen Square UCL Institute of Neurology, University College London, United Kingdom; and Servicio de Neurología (A.V.-J.), Centro de Esclerosis Múltiple de Catalunya (Cemcat), Hospital Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Spain.