1. Department of Orthopaedic Surgery, Inselspital, University of Bern, Bern, Switzerland
2. University Institute of Diagnostic, Interventional and Paediatric Radiology, University of Bern, Inselspital, Bern, Switzerland
3. American Sports Medicine Institute, Andrews Orthopaedic and Sports Medicine Center, Birmingham, Alabama, USA
4. Department of Orthopaedic Surgery and Traumatology, Fribourg Cantonal Hospital, University of Fribourg, Fribourg, Switzerland