1. Department of Neurosurgery, Karolinska University Hospital, Stockholm, Sweden.
2. Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
3. Department of Medical Sciences, Section of Neurosurgery, Uppsala University, Uppsala, Sweden.
4. Function Perioperative Care and Medicine, Karolinska University Hospital, Stockholm, Sweden.
5. Department of Physiology and Pharmacology, Section of Perioperative Medicine and Intensive Care, Karolinska Institutet, Stockholm, Sweden.
6. Department for Trauma and Orthopedic Surgery, Cologne-Merheim Medical Centre, University Witten/Herdecke, Cologne, Germany.
7. Institute for Research in Operative Medicine, University Witten/Herdecke, Cologne, Germany.
8. Medical Unit Neurology, Karolinska University Hospital, Stockholm, Sweden.