1. Department of Anesthesiology and Intensive Care Medicine, Kepler University Hospital GmbH, Johannes Kepler University Linz, Krankenhausstraße 9, 4020 Linz and Altenberger Strasse 69, 4040 Linz, Austria
2. Institute of Signal Processing, Johannes Kepler University Linz, Altenberger Strasse 69, 4040 Linz, Austria
3. Department of Cardiac, Vascular and Thoracic Surgery, Kepler University Hospital GmbH, Johannes Kepler University Linz, Krankenhausstraße 9, 4020 Linz and Altenberger Strasse 69, 4020 Linz, Austria