1. Department of Cardiac Surgery; Laboratory for Tissue Engineering, Grosshadern Medical Centre, Ludwig Maximilian University; Marchioninistr. 15 81377 Munich Germany
2. Department of Pediatric Cardiology and Pediatric Intensive Care; Grosshadern Medical Centre, Ludwig Maximilian University; Marchioninistrasse 15 81377 Munich Germany
3. Institute of Textile Technology and Process Engineering; Koerschtalstrasse 26 73770 Denkendorf Germany
4. Chair of Medical Engineering; Technical University Munich; Boltzmannstrasse 15 85748 Garching Germany