1. Department of Neurology, Hospital San Pedro de Alcántara, Cáceres, Spain
2. Department of Immunology, Hospital San Pedro de Alcántara, Cáceres, Spain
3. CIBERNED. Department of Biochemistry and Molecular Biology and Genetics, Universidad de Extremadura, Cáceres, Spain
4. Department of Neurology, Hospital Universitario Infanta Cristina, Badajoz, Spain