1. Department of Anaesthesiology, Centre of Head and Orthopaedics Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
2. Department of Anaesthesiology and Intensive Care Horsens Regional Hospital Horsens Denmark
3. Department of Clinical Medicine Aarhus University Aarhus Denmark
4. Department of Intensive Care Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
5. Department of Anaesthesiology and Intensive Care Gødstrup Hospital Herning Denmark