1. University Hospital Muenster Department of Trauma-, Hand- and Reconstructive Surgery, , Albert-Schweitzer-Campus 1, Building W1, Muenster 48149 , Germany
2. University Hospital Muenster, University of Muenster Research Group “Mathematical Surgery”, , Muenster 48149 , Germany
3. Institute of Biostatistics and Clinical Research, University of Muenster , Schmeddingstrasse 56, Muenster 48149 , Germany
4. Clinic for Radiology, University Hospital Muenster , Albert-Schweitzer-Campus 1, Building A1, Muenster 48149 , Germany
5. University Hospital Muenster Medical Management Division - Medical Controlling, , Niels-Stensen-Straße 8, Muenster 48149 , Germany