[1] Med Univ Graz, Dept Orthopaed & Trauma, Graz, Austria
[2] Kantonsspital Baselland Bruderholz Liestal Laufen, Dept Orthopaed Surg & Traumatol, Bruderholz, Switzerland
[3] Univ Basel, Basel, Switzerland
[4] Gothenburg Univ, Sahlgrenska Acad, Dept Surg, Gothenburg, Sweden
[5] AUVA UKH Steiermark, Graz, Austria
[6] Johannes Kepler Univ Linz, Linz, Austria