1. Department of Orthopaedics
2. Department of Radiology, Vienna General Hospital and the University of Vienna, Währinger Gurtel 18-20, A-1090 Vienna, Austria.
3. Landesklinik für Orthopädie Salzburg, Müllner Hauptstrasse 48, A-5020 Salzburg, Austria.
4. Institute of Medical Computer Sciences, University of Vienna, Währinger Gürtel 18-20, A-1090 Vienna, Austria.
5. Department of Orthopaedics, General Hospital Krems, Mitterweg 10, A-3500 Krems an der Donau, Austria.