1. Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
2. Department of Radiology, University of Erlangen-Nuremberg, Erlangen, Germany
3. Musculoskeletal Unit, Monash University and Rheumatology, Alfred Hospital, Melbourne, VIC, Australia
4. Department of Radiology, University of Cambridge, Cambridge, UK
5. Norwich Medical School, University of East Anglia, Norwich, UK
6. Department of Radiology, Norfolk and Norwich University Hospital, Norwich, UK
7. Department of Radiology and Biomedical Imaging, University of California, San Francisco, 400 Parnassus Ave, A-367, San Francisco, CA 94143, USA