1. Department of Osteology and Biomechanics; University Medical Center Hamburg-Eppendorf; D-22529 Hamburg Germany
2. IFG-Institute for Scientific Instruments; D-12489 Berlin Germany
3. Institute of Bone Pathology, University Medical Center Hamburg-Eppendorf; D-22529 Hamburg Germany
4. ORTHOCLINIC Hamburg; D-22457 Hamburg Germany