[1] Haukeland Hosp, Dept Neurol, Norwegian Multiple Sclerosis Competence Ctr, N-5021 Bergen, Norway
[2] Univ Bergen, Inst Clin Med, KG Jebsen MS Res Ctr, Bergen, Norway
[3] Haukeland Hosp, Clin Res Ctr, Bergen, Norway
[4] Stavanger Univ Hosp, Dept Neurol, Stavanger, Norway
[5] Stavanger Univ Hosp, Neurosci Res Grp, Stavanger, Norway
[6] Univ Bergen, Inst Clin Med, Bergen, Norway
[7] Stavanger Univ Hosp, Dept Res, Stavanger, Norway
[8] Univ Bergen, Inst Clin Med, Bergen, Norway
[9] Haukeland Hosp, Dept Physiotherapy, Bergen, Norway
[10] Haukeland Hosp, Dept Neurol, Norwegian Multiple Sclerosis Registry & Biobank, Bergen, Norway