1. University of Cologne, Medical Faculty and University Hospital Cologne, Department of Anaesthesiology and Intensive Care Medicine, Cologne, Germany
2. University of Cologne, Medical Faculty and University Hospital Cologne, Department of Anaesthesiology and Intensive Care Medicine, Cologne, Germany; FOM University of Applied Sciences, Cologne, Germany
3. University of Cologne, Medical Faculty and University Hospital Cologne, Institute of Medical Statistics and Computational Biology, Cologne, Germany
4. University of Cologne, Medical Faculty and University Hospital Cologne, Department of Anaesthesiology and Intensive Care Medicine, Cologne, Germany; University Hospital RWTH Aachen, Department of Emergency Medicine, Aachen, Germany