[1] Univ Cantabria, Univ Hosp Marques de Valdecilla, Neurol Serv, ES-39008 Santander, Spain
[2] Univ Cantabria, Univ Hosp Marques de Valdecilla, Sch Med, Unidad Genet Mol, ES-39008 Santander, Spain
[3] Univ Cantabria, Div Epidemiol & Computat Biol, Sch Med, ES-39008 Santander, Spain
[4] Univ Cantabria, CIBERESP, Sch Med, ES-39008 Santander, Spain
[5] Univ Cantabria, Univ Hosp Marques de Valdecilla, CIBERNED, ES-39008 Santander, Spain