1. Department of Traumatology and General Surgery, Berufsgenossenschaftliche Unfallklinik Murnau, 82418 Murnau, Germany
2. Department of Traumatology, Berufsgenossenschaftliche Unfallklinik Ludwigshafen, 67071 Ludwigshafen, Germany
3. Spinal Cord Injury Center, Berufsgenossenschaftliche Unfallklinik Murnau, 82418 Murnau, Germany
4. Department for Orthopaedics, Trauma Surgery and Plastic Surgery, University Hospital of Leipzig, 04103 Leipzig, Germany