1. Neurology Service and CIBERNED, “Marqués de Valdecilla” University Hospital (University of Cantabria and IFIMAV), Santander, Spain
2. Spongiform Encephalopathies Unit, National Microbiology Centre and CIBERNED, Carlos III Health Institute, Madrid, Spain
3. Alzheimer Disease Research Unit, CIEN Foundation, Carlos III Health Institute, Alzheimer Center Reina Sofia Foundation, Madrid, Spain
4. Neurology Service and CIBERNED, Hospital Universitario La Paz (U.A.M.), Madrid, Spain
5. Molecular Biology Department and CIBERNED, Centro de Biología Molecular Severo Ochoa (C.S.I.C.-U.A.M.), Madrid, Spain