1. Department of Anesthesiology, Heidelberg University Hospital, 69120 Heidelberg, Germany
2. Institute for Emergency Medicine, University Hospital Schleswig-Holstein, 24105 Kiel, Germany
3. Department of Anesthesiology and Intensive Care Medicine, University Hospital Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany
4. School of Medicine, University of Namibia, Windhoek 9000, Namibia