1. Department of Orthopaedic Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
2. Department of Diagnostic, Interventional and Pediatric Radiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
3. Department of Orthopaedic Surgery, Lucerne Cantonal Hospital, Lucerne, Switzerland.
4. Department of Orthopaedic Surgery, Fribourg Cantonal Hospital, University of Fribourg, Fribourg, Switzerland.