1 Department of Anaesthesia, Section 6011, Center of Head and Orthopaedics, Rigshospitalet, Inge Lehmanns Vej 6, 2100, Copenhagen, Denmark. Asger.sonne@regionh.dk.
2 Department of Anaesthesia, Section 6011, Center of Head and Orthopaedics, Rigshospitalet, Inge Lehmanns Vej 6, 2100, Copenhagen, Denmark.
3 Department of Neurosurgery, The Neuroscience Centre, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
4 Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.
5 Copenhagen Emergency Medical Services, Copenhagen, Denmark.
6 Research Unit of General Practice, Department of Public Health, University of Southern Denmark, Odense, Denmark.
7 The Research Unit for General Practice and Section of General Practice, Department of Public Health, University of Copenhagen, Copenhagen, Denmark.
8 Department of Emergency Medicine, Copenhagen University Hospital - Nordsjællands Hospital, Hillerød, Denmark.