1. Department of Radiology, University Medical Center, Regensburg, Germany
2. Department of Radiology, Asklepios Medical Center, Bad Abbach, Germany
3. Department of Rheumatology and Clinical Immunology, Asklepios Medical Center, Bad Abbach, Germany
4. Department of Orthopedics II, Asklepios Medical Center, Bad Abbach, Germany
5. Department of Orthopedics, University Medical Center, Regensburg, Germany
6. Department of Internal Medicine I, University Medical Center, Regensburg, Germany