1 Department of Anaesthesiology and Intensive Care Medicine, Kepler University Hospital and Johannes Kepler University Linz, Altenbergerstrasse 69, 4020 Linz, Austria. Electronic address: jens.meier@kepleruniklinikum.at.
2 Department of Anaesthesiology and Intensive Care Medicine, Kepler University Hospital and Johannes Kepler University Linz, Altenbergerstrasse 69, 4020 Linz, Austria.
3 University of Applied Science Upper Austria, Faculty of Informatics, Communications and Media, Softwarepark 11, 4232 Hagenberg, Austria.