1 Department of Anaesthesiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120, Heidelberg, Germany. stephan.katzenschlager@med.uni-heidelberg.de.
2 Division of Emergencies and Critical Care, Department of Research and Development, Oslo University Hospital, Oslo, Norway.
3 Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
4 Clinic of Anaesthesia and Intensive Care, St Olav's Hospital, Trondheim University Hospital, Trondheim, Norway.
5 Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway.
6 Division of Emergencies and Critical Care, Department of Anaesthesiology and Intensive Care, Oslo University Hospital, Oslo, Norway.
7 Institute for Emergency Medicine, University Hospital Schleswig-Holstein, Kiel, Germany.
8 Department of Anesthesiology and Intensive Care Medicine, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany.
9 School of Medicine, University of Namibia, Windhoek, Namibia.
10 Department of Anaesthesiology, Heidelberg University Hospital, Im Neuenheimer Feld 420, 69120, Heidelberg, Germany.
11 Division of Prehospital Services, Oslo University Hospital, Oslo, Norway.