1 Division of Neurosurgery, Department of Clinical Neurosciences, University of Cambridge, Cambridge Biomedical Campus, Cambridge, United Kingdom, 2 Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden, 3 Department of Physiology and Pharmacology, Section of Perioperative Medicine and Intensive Care, Karolinska Institute, Stockholm, Sweden, 4 Skane University Hospital, D...