1. Department of Orthopaedics and Trauma Surgery; University Medical Center Mannheim; Medical Faculty Mannheim of Heidelberg University; Theodor-Kutzer-Ufer 1-3, Mannheim 68167 Germany
2. Department of Trauma and Orthopaedics; BG Trauma Center Ludwigshafen; Ludwig-Guttmann-Strasse 13 Ludwigshafen 67071 Germany