1. Joint Department of Medical Imaging, Faculty of Medicine, University of Toronto, Mount Sinai Hospital, 600 University Avenue, Toronto, ON, Canada M5G 1X5
2. SECTRA Imtec AB, Teknikringen 20, 583 30 Linkoping, Sweden
3. Department of Rheumatology, Royal Free Hospital, Pond Street, London NW3 2GQ, UK
4. Department of Radiology, Imperial College Healthcare NHS Trust, Charing Cross Hospital, Fulham Palace Road, London W6 8RF, UK
5. Department of Radiology, King’s College Hospital NHS Foundation Trust, Denmark Hill, London SE5 9RS, UK
6. Division of Imaging Sciences, King’s College London, The Rayne Institute, 3rd Floor, Lambeth Wing, St. Thomas’ Hospital, London SE1 7EH, UK
7. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford OX3 7LD, UK