1 Department of Anaesthesiology and Intensive Care Medicine, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Kerpener Str. 62, 50937, Cologne, Germany. hendrik.drinhaus@uk-koeln.de.
2 Department of Anaesthesiology and Intensive Care Medicine, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Kerpener Str. 62, 50937, Cologne, Germany.