1. Department of Anesthesia, Dalhousie University, Halifax, NS, Canada
2. Department of Anesthesia and Intensive Care Medicine, Ernst Moritz Arndt University Greifswald, Greifswald, Germany
3. Faculty of Medicine, Department of Orthodontics, University of Greifswald, Greifswald, Germany
4. Department of Anaesthesiology and Intensive Care, DRK Kliniken Berlin, Germany
5. Faculty of Medicine Hradec Kralove, Department of Anesthesiology and Intensive Care Medicine, Charles University Prague, Czech Republic