1. Department of Trauma Surgery, Evangelic Hostpital Oldenburg, 26122 Oldenburg, Germany
2. Department of General Trauma and Reconstructive Surgery, University Hospital of Munich, 81377 Munich, Germany
3. Laboratory for Biomechanics and Experimental Orthopaedics, University Hospital of Munich, 81377 Munich, Germany
4. Institute of Plastics Processing, RWTH Aachen, 52062 Aachen, Germany
5. Deparment of Dermatology, University Hospital of Munich, 80337 Munich, Germany