Peter Teschendorf1, Michael Bernhard2. 1. Department of Anesthesiology and Intensive Care Medicine, Hospital of Osnabrück, Am Finkenhügel 1, D-49076 Osnabrück, Germany. Electronic address: peter.teschendorf@klinikum-os.de. 2. Emergency Department, University Hospital of Leipzig, Liebigstraße 26, D-4105 Leipzig, Germany. Electronic address: Michael.bernhard@medizin.uni-leipzig.de.