1. Department of Rheumatology, St George’s University Hospitals NHS Foundation Trust, London SW17 0QT, UK
2. Rheumatology Department, Royal Sussex County Hospital, University Hospitals Sussex NHS Foundation Trust, Brighton BN2 5BE, UK
3. School of Medicine, Keele University, Keele ST5 5BG, UK
4. Haywood Academic Rheumatology Centre, Midlands Partnership NHS Foundation Trust, Stoke-on-Trent ST6 7AG, UK