[1] Hosp Clinico San Carlos IdISSC, Inst Invest Sanitaria, Grp Invest Factores Ambientales Enfermedades Dege, Madrid, Spain
[2] Salford Royal NHS Fdn Trust, Neurol Serv, Salford, Lancs, England
[3] Hosp Univ Quironsalud Madrid, Dept Neurol, Pozuelo De Alarcon, Spain