1. Department of Trauma and Reconstructive Surgery; RWTH Aachen University Hospital Aachen; Aachen Germany
2. Department of Orthopaedic Trauma and Harald-Tscherne Laboratory; University Hospital Zurich, University of Zurich; Ramistr; 100, 8091 Zuerich Switzerland
3. Institute for Laboratory Animal Science and Experimental Surgery; RWTH Aachen University; Aachen Germany