1. Department of Radiology, Nuffield Orthopaedic Centre, Oxford University Hospitals NHS Foundation Trust, Headington, Oxford, United Kingdom
2. Department of Radiology, Universitair Ziekenhuis Brussel, Brussels, Belgium
3. Department of Radiology, Cochin Hospital, Paris, France
4. Department of Radiology, National Institute of Geriatrics, Rheumatology and Rehabilitation, Warsaw, Poland
5. Department of Radiology, Ghent University Hospital, Ghent, Belgium