1 Departments of Neurosurgery, Neurology and Neurosciences.
2 Anesthesia, Perioperative Medicine and Critical Care.
3 IdiSNA, Instituto de Investigación Sanitaria de Navarra, Pamplona.
4 Department of Neurosurgery, Neurology and Neurosciences, Hospital Universitario Fundación Jiménez Díaz, Autonomous University of Madrid, Madrid, Spain.
5 Research Support Service, Central Clinical Trials Unit, Clínica Universidad de Navarra, University of Navarra.