1. Department of Orthopaedic Surgery, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
2. Biomechanics Laboratory, Department of Sport and Movement Sciences, University of Duisburg-Essen, Essen, Germany
3. Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich, Campus Großhadern, Munich, Germany
4. Faculty of Health Sciences, University of Witten/Herdecke, Witten, Germany
5. Sportklinik Duisburg, Duisburg, Germany
6. Department of Dermatology, Venereology and Allergology, Ruhr-University Bochum, Bochum, Germany