[1] Multiple Sclerosis Ctr Catalonia, Barcelona, Spain
[2] Vall dHebron Hosp, Prevent Med & Epidemiol Dept, Barcelona, Spain
[3] CAHIAQ, Barcelona, Spain
[4] Hosp Clin Barcelona, Neuroimmunol Multiple Sclerosis Grp, Barcelona, Spain
[5] Doctor Josep Trueta Hosp, Neuroimmunol & Multiple Sclerosis Unit UNIEM, Girona, Spain