1. Department of Orthopaedic Surgery, University Medical Center Rostock, Rostock, Germany
2. Department of Orthopedic Surgery and Traumatology, Freiburg University Hospital, Freiburg, Germany
3. Department of Radiology, RKK-Klinikum Freiburg, Freiburg, Germany
4. Alphaclinic Zurich, Kraftstrasse 29, 8044 Zurich, Switzerland