1. Department of Clinical Neurophysiology, Marqués de Valdecilla University Hospital, Santander, Cantabria, Spain
2. Department of Physiology and Pharmacology, School of Medicine, University of Cantabria (UNICAN), Santander, Cantabria, Spain
3. Instituto de Formación e Investigación Marqués de Valdecilla (IFIMAV), Santander, Spain
4. Department of Intensive Medicine, Marqués de Valdecilla University Hospital, Santander, Cantabria, Spain