1. Primary Care Centre Versus Arthritis, Keele University, Keele ST5 5BG, UK
2. Haywood Academic Rheumatology Centre, Haywood Hospital, Stoke on Trent ST6 7AG, UK
3. Department of Medicine, Faculty of Medicine, University of Malaya, Malaysia
4. Department of Rheumatology, Altnagelvin Hospital, Londonderry BT47 6SB, UK