1. Department of Neurology, 12 de Octubre Hospital, Madrid, Spain
2. Department of Neurology, Sagrado Corazón Clinic, Seville, Spain
3. La Fe Hospital, Valencia, Spain
4. Department of Neurology, Santa Creu i Sant Pau Hospital, Barcelona, Spain
5. Neuropathology Institute IDIBELL, Bellvitge Hospital, Barcelona, Spain
6. Department of Neurology, La Paz Hospital, Madrid, Spain
7. Department of Neurology, Donostia Hospital, San Sebastián, Spain
8. Clinical Biochemistry Section, Virgen del Rocío Hospital, Seville, Spain
9. Molecular Oncogenetic Unit, Institute of Medical and Molecular Genetics, La Paz Hospital, Madrid, Spain
10. Institute of Clinical Chemistry and Department of Pediatrics, Hamburg University Medical Center, Hamburg, Germany