1. Department of Clinical Neuroscience, Institute of Neuroscience and Physiology, Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
2. Department of Neurology and Rehabilitation Södra Älvsborg Hospital Borås Sweden
3. Deparment of Anesthesiology and Intensive Care Sahlgrenska University Hospital Gothenburg Sweden
4. Department of Anesthesiology and Intensive Care, Institute of Clinical Sciences Sahlgrenska Academy, University of Gothenburg Gothenburg Sweden
5. Department of Neurosurgery, Institute of Neuroscience and Physiology, Sahlgrenska Academy University of Gothenburg Gothenburg Sweden