1. Department of Orthopaedics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
2. Department of Osteology and Biomechanics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
3. Center of Musculoskeletal Surgery, Diaconical Clinics Hamburg, Hospital Alten Eichen, Hamburg, Germany.
4. Department of Diagnostic and Interventional Radiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
5. Department of Biochemistry and Molecular Biology II: Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.