1. From the Department of Neurology (J.S.-G., A.V.-J., X.M., M.T.), Multiple Sclerosis Centre of Catalonia (Cemcat), Hospital Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Spain; NMR Research Unit (A.T.T.), Queen Square MS Centre, Department of Neuroinflammation, UCL Queen Square Institute of Neurology, University College London, United Kingdom; Department of Neurology and Division of Neuroradiology (C.E.), Vascular and Interventional Radiology, Department of Radiology, Medical...