1. 1Department of Trauma Surgery and Sports Medicine, Garmisch-Partenkirchen Medical Center, Garmisch-Partenkirchen, Germany
2. 2Department of Orthopaedics and Traumatology, Paracelsus Medical University, Nuremberg, Germany
3. 3Institute for Community Medicine, SHIP/Clinical-Epidemiological Research, University of Greifswald, Greifswald, Germany
4. 4Department of Trauma and Orthopedic Surgery, University Medicine Greifswald, Greifswald, Germany
5. 5Department of Trauma Surgery, Helios Kliniken Schwerin, Schwerin, Germany
6. 6Department of Plastic Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
7. 7Institute for Hand- and Plastic Surgery, Oldenburg, Germany