1. Aesculap AG Research and Development, 78532 Tuttlingen, Germany
2. Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, Ludwig Maximilians University Munich, Campus Grosshadern, 81377 Munich, Germany
3. Department of Orthopaedics and Trauma Surgery, University of Duisburg-Essen, 45147 Essen, Germany
4. Department of Orthopaedic Surgery, Hannover Medical School, 30625 Hannover, Germany
5. Department of Orthopaedic and Trauma Surgery, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany