1 KG Jebsen MS Research Centre, Department of Clinical Medicine, University of Bergen, Bergen, Norway. nina.grytten@helse-bergen.no.
2 Norwegian Multiple Sclerosis Competence Centre, Department of Neurology, Haukeland University Hospital, Bergen, Norway. nina.grytten@helse-bergen.no.
3 KG Jebsen MS Research Centre, Department of Clinical Medicine, University of Bergen, Bergen, Norway.
4 Norwegian Multiple Sclerosis Competence Centre, Department of Neurology, Haukeland University Hospital, Bergen, Norway.
5 Norwegian Multiple Sclerosis Registry and Biobank, Department of Neurology, Haukeland University Hospital, Bergen, Norway.