Institute of Biomedical Engineering, Graz University of Technology, Krenngasse 37, 8010 Graz, Austria.|Institute of Biomedical Engineering, Graz University of Technology, Krenngasse 37, 8010 Graz, Austria.|Institute of Biomedical Engineering, Graz University of Technology, Krenngasse 37, 8010 Graz, Austria.