1. Department of Surgical and Perioperative Sciences; Anaesthesiology and Intensive Care; Umeå University; Umeå Sweden
2. Department of Public Health and Clinical Medicine; Medicine; Umeå University; Umeå Sweden
3. Department of Pharmacology and Clinical Neuroscience; Neurosurgery; Umeå University; Umeå Sweden
4. Department of Anaesthesiology and Intensive Care; Institute of Clinical Sciences; Sahlgrenska Academy at the University of Gothenburg; Gothenburg Sweden