1. Department of Trauma and Orthopedic Surgery, University Witten Herdecke Faculty of Health, Witten, Germany
2. Institute of Sport and Sport Science, University of Freiburg, Freiburg, Germany
3. Department of Trauma and Reconstructive Surgery with Division of Knee and Shoulder Surgery, Sports Traumatology, Asklepios Clinic St. Georg, Hamburg, Germany
4. Department of Sport Medicine Humboldt University and Charité University School of Medicine, Charité Universitätsmedizin Berlin, Berlin, Germany
5. Vice-rectorate for Teaching and Studies Central Evaluation of Studies and Teaching, University of Cologne, Koeln, Germany
6. Department of Trauma Surgery and Sports Traumatology, Sana Dreifaltigkeits-Krankenhaus Koln-Braunsfeld GmbH, Koln, Germany