1 From the Charité - Universitätsmedizin Berlin, Department of Anaesthesiology and Operative Intensive Care Medicine, Campus Virchow-Klinikum and Campus Charité Mitte, Augustenburger Platz 1, Berlin (SK, CS), Department of Anaesthesiology, Medical Faculty University Hospital RWTH Aachen, Aachen (RR, AK), Department of Anaesthesiology and Intensive Care, University Hospital Bonn, Bonn (MC), Klinik für Anästhesie und Intensivmedizin, Diakonie Klinikum Stuttgart (SP) and Department of Anaesthesiology, Intensive Care, Emergency Medicine and Pain Therapy, Kliniken Landkreis Karlsruhe, Fuerst-Stirum-Klinik Bruchsal and Rechbergklinik Bretten, Germany (MS).