1. Department of Urology, Lukas Hospital, 41464 Neuss, Germany
2. German Centre for Assessment and Evaluation of Innovative Techniques in Medicine (DZITM), 41464 Neuss, Germany
3. Department of Surgery, Lukas Hospital, 41464 Neuss, Germany
4. ITERA (International Tissue Engineering Research Association), 2000 Antwerpen, Belgium
5. Department of Surgery, University of Antwerpen, 2000 Antwerpen, Belgium
6. German Centre for Implant-Pathology, 52351 Düren, Germany
7. Department of Experimental Surgery, University of Szeged, H-6720 Szeged, Hungary