1. Department for Orthopaedics and Orthopaedic Surgery, Greifswald Medical University
2. University Chair for Political Education, Faculty for Social Sciences and Philosophy, Leipzig University
3. Department for Orthopaedics, Trauma and Plastic Surgery, Leipzig University
4. Orthopaedic Clinic and Outpatient Department, University Medical Centre Rostock
5. Department for Orthopaedics and Trauma Surgery, BG Trauma Centre Hamburg
6. Department for Orthopaedics and Trauma Surgery, Essen University Medical Hospital