1 From the Queen Square MS Centre (Y.L.), UCL Queen Square Institute of Neurology, Faculty of Brain Sciences, University College London, UK; Multiple Sclerosis Centre of Catalonia (C.T.), Neurology Department, Vall d'Hebron Barcelona Hospital Campus, Spain. yael@doctors.net.uk.
2 From the Queen Square MS Centre (Y.L.), UCL Queen Square Institute of Neurology, Faculty of Brain Sciences, University College London, UK; Multiple Sclerosis Centre of Catalonia (C.T.), Neurology Department, Vall d'Hebron Barcelona Hospital Campus, Spain.