1. Institute of Biophysics, Medical University of Graz, Harrachgasse 21/IV, 8010 Graz, Austria
2. Department of Mechanical Engineering, University of California, 5126 Etcheverry Hall, Berkeley, CA 94720, USA
3. Department of Congenital Heart Disease/Pediatric Cardiology, German Heart Institute Berlin, Augustenburger Platz 1, 13353 Berlin, Germany