[1] Hosp Carlos G Durand, Dept Immunol & Histocompatibil, Buenos Aires, DF, Argentina
[2] Hosp Carlos G Durand, Dept Neurol, Buenos Aires, DF, Argentina
[3] Hosp Aleman, Dept Neurosci, Neuroimmunol Unit, Zaragoza, Spain
[4] Fdn Lucha Enfermedades Neurol Infancia, Dept Neurol, Buenos Aires, DF, Argentina
[5] Hosp Luis C Lagomaggiore, Dept Neurol, Mendoza, Argentina
[6] Hosp Rafael Angel Calderon Guardia, Dept Rheumatol, San Jose, Costa Rica
[7] Hosp Galan & Rocha, Dept Internal Med, Paysandu, Uruguay
[8] Hosp Cent Inst Previs Social, Dept Neurol, Asuncion, Paraguay
[9] Hosp Cent Inst Previs Social, Dept Rheumatol, Asuncion, Paraguay
[10] Hosp Clin Univ Nacl Asunc, Dept Rheumatol, Asuncion, Paraguay
[11] Hosp Carlos Andrade Marin, Dept Neurol, Quito, Ecuador
[12] Hosp Nacl Edgardo Rebagliati Martins, Rheumatol Div, Lima, Peru
[13] Hosp Especialidades Ctr Med La Raza, Ctr Med Nacl Siglo XXI, Dept Rheumatol, Mexico City, DF, Mexico
[14] Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Dept Immunol & Rheumatol, Mexico City, DF, Mexico
[15] Hosp Alta Especialidad Dr Gustavo A Rovirosa Pere, Dept Internal Med, Villahermosa, Tabasco, Mexico
[16] Univ Fed Sao Paulo, Dept Med, Rheumatol Div, Sao Paulo, Brazil
[17] Clin Las Condes, Dept Rheumatol, Santiago, Chile