1. Department of Anaesthesiology and Intensive Care Medicine, Charité - Universitätsmedizin Berlin, Campus Virchow-Klinikum and Campus Charité Mitte, Berlin, Germany
2. Department of Emergency Medicine, Bundeswehrkrankenhaus Berlin, Berlin, Germany
3. Department of Anaesthesiology and Intensive Care Medicine, Asklepios Klinik Harburg, Hamburg, Germany