1 Department of Urology, Lukas Hospital, 41464 Neuss, Germany ; German Centre for Assessment and Evaluation of Innovative Techniques in Medicine (DZITM), 41464 Neuss, Germany.
2 German Centre for Implant-Pathology, 52351 Düren, Germany.
3 Department of Surgery, University of Aachen, 52074 Aachen, Germany.
4 Department of Experimental Surgery, University of Szeged, Szeged 6720, Hungary.
5 Department of Surgery, University of Antwerp, 2000 Antwerp, Belgium.
6 Institute for Regenerative Medicine, Winston-Salem, NC 27101, USA.