1. Centre for Rheumatology, Division of Medicine, University College London , London, UK ; , Bloomsbury, London WC1E 6JF, UK
2. Rayne Institute, 5 University St , London, UK ; , Bloomsbury, London WC1E 6JF, UK
3. Department of Rheumatology, Barking Havering and Redbridge University Hospitals NHS Trust , London, UK
4. Department of Rheumatology, North Middlesex University Trust , London, UK