[1] Hosp Univ Gregorio Maranon, Dept Neurol, Madrid, Spain
[2] Roche Farma, Dept Med, Madrid, Spain
[3] Hosp Sant Pau, Dept Neurol, Madrid, Spain
[4] Hosp Clin Univ Virgen de la Arrixaca, Dept Neurol, Madrid, Spain
[5] Hosp Univ Dr Peset, Dept Neurol, Madrid, Spain
[6] Hosp Univ La Princesa, Dept Neurol, Madrid, Spain
[7] Hosp Univ Ramon y Cajal, Dept Immunol, Madrid, Spain
[8] Hosp Univ Bellvitge, Dept Neurol, Madrid, Spain
[9] Hosp Univ Reina Sofia, Dept Neurol, Madrid, Spain
[10] Complejo Asistencial Avila, Avila, Spain
[11] Hosp Univ Ramon y Cajal, Dept Neurol, Madrid, Spain
[12] St Michaels Hosp, Dept Neurol, Toronto, ON, Canada