1. Medical Faculty, Johannes Kepler University Linz, 4020 Linz, Austria
2. Department of Orthopedic Surgery, Ordensklinikum Linz Barmherzige Schwestern, Vinzenzgruppe Center of Orthopedic Excellence, Teaching Hospital of the Paracelsus Medical University, 5020 Salzburg, Austria
3. Department of Marketing and Electronic Business, University of Applied Sciences Upper Austria, 4400 Steyr, Austria
4. Department of Orthopedics and Trauma, Medical University of Graz, Austria Auenbruggerplatz 5, 8036 Graz, Austria