1. Clinical Neurophysiology Department; University General Hospital of Castellon, Avenida Benicasim s/n; E12004 Castellon de la Plana Spain
2. Teaching Unit, University General Hospital of Castellon; Castellon de la Plana Spain
3. Clinical Neurophysiology Department; University Hospital; la Ribera Valencia Spain
4. Physiology Department, Faculty of Medicine; Valencia Spain