1. Department of Neurological Surgery, Hospital Universitario Marqués de Valdecilla;
2. Hospital-at-Home Department, Hospital Universitario Marqués de Valdecilla;
3. Department of Anesthesiology, Hospital Universitario Marqués de Valdecilla;
4. Fundación Instituto de Investigación Marqués de Valdecilla (IDIVAL), Santander, Cantabria;
5. Ciencias Jurídicas y Empresariales, Universidad de Cantabria, Santander, Cantabria, Spain;
6. Medtronic Ibérica, Madrid, Spain
7. Department of Anesthesia and Pain Management, Toronto Western Hospital, University of Toronto;
8. Division of Neurosurgery, Toronto Western Hospital, University of Toronto, Ontario, Canada;
9. Department of Anatomy and Cell Biology, Universidad de Cantabria, Santander, Cantabria; and