1. Center of Orthopedics and Trauma Surgery, University Clinic of Brandenburg, Hochstr. 29, 14770 Brandenburg an der Havel, Germany
2. Medical School of Brandenburg, Fehbellinerstr 38, 16816 Neuruppin, Germany
3. Center of Evidence Based practice Brandenburg (EBB), A JBI Affiliated Group, 14770 Brandenburg an der Havel, Germany
4. Department of Orthopaedic Surgery, Sana Kliniken Sommerfeld, 16766 Kremmen, Germany
5. Center for Health Services Research, Faculty for Health Sciences, University Clinic of Brandenburg, Seebad 82/83, 15562 Rüdersdorf bei Berlin, Germany