1. Neurology Department, Donostia University Hospital, San Sebastián, Spain,
2. Department of Neurosciences, Biodonostia Health Research Institute, San Sebastián, Spain,
3. Physiology Department, Medicine and Nursing School, University of the Basque Country UPV/EHU, Lejona, Spain,
4. Neurology Department, Sierrallana Hospital, Torrelavega, Spain,
5. CIBERNED (Network Center for Biomedical Research in Neurodegenerative Diseases), Carlos III Institute of Health, Madrid, Spain,
6. Neurology Department, Araba University Hospital, Vitoria-Gasteiz, Spain, and
7. Neurosciences Department, Medicine and Nursing School, University of the Basque Country UPV/EHU, San Sebastian, Spain