[1] Hosp Italiano Buenos Aires, Ctr Esclerosis Multiple Buenos Aires, Buenos Aires, DF, Argentina
[2] Hosp Metropolitan Quito, Serv Neurol, Quito, Ecuador
[3] Hosp Sirio Libanes, Multiple Sclerosis Ctr, Sao Paulo, Brazil
[4] Clin Alemana Santiago Chile, Ctr Esclerosis Multiple, Santiago, Chile
[5] Pontifica Catholic Univ Rio Grande Sul PUCRS, Brain Inst Rio Grande Sul, Porto Alegre, RS, Brazil
[6] Hosp Britan Buenos Aires, MS Sect, Buenos Aires, DF, Argentina
[7] INECO, Neurociencias Fdn Favaloro, Buenos Aires, DF, Argentina
[8] Inst Nacl Neurol & Neurocirug, Mexico City, DF, Mexico
[9] Ctr Neurol ABC Santa Fe, Mexico City, DF, Mexico
[10] Clin Las Condes, Santiago, Chile
[11] Hosp Enrique Tornu, Buenos Aires, DF, Argentina
[12] Sanat Guemes, Buenos Aires, DF, Argentina
[13] Hosp Ramos Mejia, Clin Esclerosis Multiple, Buenos Aires, DF, Argentina
[14] Sistema Nacl Salud Colombiano, Clin Marly Bogota, Bogota, Colombia
[15] Hosp Italiano Buenos Aires, Clin Res Sect, Buenos Aires, DF, Argentina
[16] Univ Interamer Panama, Hosp Santo Tomas, Clin Esclerosis Multiple, Serv Neurol, Panama City, Panama
[17] Hosp IMT, Dept Neurol, Asuncion, Paraguay
[18] Dept Neurol Diagnost Codas Thompson, Asuncion, Paraguay
[19] Univ Guadalajara, Ctr Univ Ciencias Salud, Dept Neurociencia, Guadalajara, Jalisco, Mexico
[20] Clin Univ Colombia, Clin Enfermedad Desmielinizante, Bogota, Colombia
[21] Hosp Espanol Mexico, Mexico City, DF, Mexico
[22] FLENI, Inst Neurol Res Dr Raul Carrea, Dept Neurol, Buenos Aires, DF, Argentina