1. Department of Orthopedics and Trauma Surgery; Medical University of Graz, Austria; Auenbruggerplatz 5 Graz 8036 Austria
2. Institute for Statistics and Mathematics, Vienna University of Economics and Business, Austria; Welthandelsplatz 1 Wien 1020 Austria
3. AUVA Trauma Hospital Graz, Austria; Göstinger Straße 24 Graz 8020 Austria
4. State Hospital Hochsteiermark/Leoben, Austria; Vordernberger Straße 42 Leoben 8700 Austria
5. Institute of Anatomy, Medical University of Graz, Austria; Harrachgasse 21 Graz 8010 Austria