1. Department for Trauma and Reconstructive Surgery, BG Hospital Bergmannstrost, 06112 Halle (Saale), Germany
2. Department for Trauma and Reconstructive Surgery, University Hospital Halle, 06120 Halle (Saale), Germany
3. Department for Orthopaedics, Trauma and Reconstructive Surgery, RWTH Aachen University Hospital, 52074 Aachen, Germany
4. Department of Orthopaedic Surgery, Klinikum Wels-Grieskirchen, 4600 Wels, Austria
5. Department of Oral, Maxillofacial and Plastic Facial Surgery, University Hospital Aachen, 52074 Aachen, Germany
6. Department for Orthopaedic and Trauma Surgery, Academic Hospital Bolzano, Teaching Hospital of the Paracelsus Medical University, 5110 Oberndorf, Italy