1. Department of Orthopaedics and Trauma Medical University of Graz Graz Austria
2. Department of Orthopaedic Surgery and Traumatology Kantonsspital Baselland (Bruderholz, Liestal, Laufen) Bruderholz Switzerland
3. University of Basel Basel Switzerland
4. Department of Surgery, Sahlgrenska Academy Gothenburg University Gothenburg Sweden
5. AUVA UKH Steiermark Graz Austria
6. Johannes Kepler University Linz Austria