[1] Charles Univ Prague, Dept Neurol, Fac Med 1, Prague, Czech Republic
[2] Charles Univ Prague, Fac Med 1, Ctr Clin Neurosci, Prague, Czech Republic
[3] Gen Univ Hosp, Prague, Czech Republic
[4] Copenhagen Univ Hosp, Dept Neurol, Danish Multiple Sclerosis Registry, Rigshosp, Glostrup, Denmark