1. Center of Orthopaedics and Traumatology, University Hospital Brandenburg/Havel, Brandenburg Medical School, Hochstr. 29, 14770 Brandenburg an der Havel, Germany
2. Faculty of Health Science, Brandenburg Medical School, 14770 Brandenburg an der Havel, Germany
3. Center of Evidence Based Practice in Brandenburg (EBB), A JBI Affiliated Group, Brandenburg Medical School, 14770 Brandenburg an der Havel, Germany
4. Center for Health Services Research, Brandenburg Medical School, 15562 Rüdersdorf, Germany