1. Division of Anaesthesia, University of Cambridge, Addenbrooke's Hospital, Cambridge, United Kingdom.
2. Department of Intensive Care Medicine, University Hospital Inselspital, Bern, Switzerland.
3. Department of Neurosurgery, UMC Leiden, Leiden, the Netherlands.
4. Department of Critical Care, University of Groningen, UMC Groningen, Groningen, the Netherlands.
5. Center for Medical Decision Sciences, Department of PH, Erasmus MC, Rotterdam, the Netherlands.
6. Department of Neurosurgery, University Hospital Antwerp - University of Antwerp, Edegem, Belgium.