[1] Univ Buenos Aires, Fac Med, Hosp Ramos Mejia, Ctr Univ Esclerosis Multiple CUEM, Urquiza 609,C1221 ADC, Buenos Aires, DF, Argentina
[2] Sanatorio Guemes Hosp Privado, Div Neurol, Buenos Aires, DF, Argentina
[3] Hosp Aleman, Dept Neurosci, Neuroimmunol Unit, Buenos Aires, DF, Argentina
[4] Hosp IMT, Ctr Nacl Esclerosis Multiple, Paraguay Dept Neurol Diagnost Codas Thompson, Asuncion, Paraguay
[5] Baylor Coll Med, Dept Neurol, Houston, TX 77030 USA
[6] Univ Interamer Panama, Fac Ciencias Salud, Hosp Santo Tomas, Clin Esclerosis Multiple,Serv Neurol, Panama City, Panama
[7] Ctr Esclerosis Multiple Buenos Aires CEMBA, Buenos Aires, DF, Argentina