[1] Haukeland Hosp, Dept Neurol, Norwegian Multiple Sclerosis Competence Ctr, Bergen, Norway
[2] Univ Bergen, Dept Clin Med, Bergen, Norway
[3] Haukeland Hosp, Dept Immunol & Transfus Med, Bergen, Norway
[4] Haukeland Hosp, Dept Hematol, Bergen, Norway
[5] Haukeland Hosp, Norwegian Multiple Sclerosis Registry & Biobank, Dept Neurol, Bergen, Norway