1 Department for Cardiac Surgery, Medical University of Vienna, Vienna, Austria Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria Department for Cardiac Surgery, Medical University of Vienna, Vienna, Austria Department for Cardiovascular Anaesthesia, Medical University of Vienna, Vienna, Austria Department for Cardiac Surgery, Medical University of Vienna, Vienna, Austria Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria Ludwig-Boltzmann-Cluster for Cardiovascular Research, Vienna, Austria Department for Cardiac Surgery, Medical University of Vienna, Vienna, Austria Ludwig-Boltzmann-Cluster for Cardiovascular Research, Vienna, Austria.