1. Department of Orthopaedics, Trauma and Reconstructive Surgery, University Hospital Leipzig
2. Centre for Spinal Surgery, Schoen Hospitals, Fürth
3. Centre for Trauma and Orthopaedic Surgery, Ev. Stift St. Martin, Community Hospital Mittelrhein, Koblenz
4. Orthopaedic and Trauma Surgery, Sana Hospital Leipziger Land, Borna
5. Orthopaedic and Trauma Centre, Alb Fils Hospitals, Göppingen
6. Clinic and Outpatient Department for Orthopaedic and Trauma Surgery, Cologne University Hospital
7. Spine Centre, Schoen Hospital Hamburg Eilbek
8. Trauma Surgery, Halle University Hospital