1. Department of Rheumatology, Oxford University Hospitals, Oxford
2. Oxford Eye Hospital, Oxford University Hospitals, Oxford
3. Department of Emergency Medicine, Stoke Mandeville Hospital, Aylesbury
4. School of Medicine, Rheumatology and Musculoskeletal Science, University of Oxford, Oxford, UK
5. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Science, University of Oxford, Oxford, UK