1. Department of Orthopedics, König-Ludwig-Haus, University of Würzburg, Brettreichstraße 11, 97070 Wuerzburg, Germany
2. Department of Orthopedic Surgery, Klinikum Grosshadern, Ludwig-Maximilians-University of Munich, Marchioninistraße 15, 81377 Munich, Germany
3. Department of Orthopaedics and Sports Orthopaedics, Klinikum Rechts der Isar, School of Medicine, Technical University of Munich, Ismaninger Straße 22, 81675 Munich, Germany
4. Department of Orthopedics and Trauma Surgery, University Hospital Bonn, Venusberg Campus 1, 53127 Bonn, Germany
5. Department of Orthopaedic Surgery, Klinikum Rechts der Isar, Technical University of Munich, Ismaninger Straße 22, 81675 Munich, Germany
6. Department of Orthopaedics and Trauma Surgery, Klinikum Nürnberg Campus Süd, Paracelsus Medical University, Breslauer Straße 201, 90472 Nürnberg, Germany
7. Department of Orthopaedic Surgery, Annastift Hannover, Medical School Hannover, Borries Str. 1-6, 30625 Hannover, Germany