1. Center of Orthopaedics and Traumatology, Brandenburg Medical School, University Hospital Brandenburg an der Havel, 14770 Brandenburg an der Havel, Germany
2. Department of Orthopedics, University Hospital Mostar, 88000 Mostar, Bosnia and Herzegovina
3. Department of General and Visceral Surgery, Minimally Invasive Surgery and Coloproctology, St. Marien Hospital, 12249 Berlin, Germany
4. Department for Orthopaedics and Trauma Surgery, Siloah St. Trudpert Hospital, 75179 Pforzheim, Germany
5. Faculty of Applied Computer Science, Deggendorf Institute of Technology, 94469 Deggendorf, Germany
6. Department of Surgical Propaedeutics, Faculty of Medicine, Medical University of Pleven, 5800 Pleven, Bulgaria
7. Department of Surgical Diseases, Faculty of Medicine, Medical University of Pleven, 5800 Pleven, Bulgaria