1. Department of Rheumatology, University Hospitals of Birmingham, Birmingham, UK
2. Department of Medicine, Northampton General Hospital, Northampton, UK
3. Department of Medicine, Barnet Hospital, London, UK
4. Department of Medicine, Kings College London, London, UK
5. Department of Rheumatology, University Hospitals of Leicester NHS Trust, Leicester, UK
6. College of Life Sciences, University of Leicester, Leicester, UK
7. Department of Rheumatology, Royal Free London NHS Foundation Trust, London, UK
8. Division of Medicine, University College London, London, UK