1. The Kellgren Centre for Rheumatology, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
2. MRC Biostatistics Unit, School of Clinical Medicine, University of Cambridge, Cambridge, UK
3. Rheumatology Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
4. Centre for Rheumatology, Division of Medicine, University College London, London, UK
5. Rheumatology Department, City Hospital, Sandwell and West Birmingham NHS Trust, Birmingham, UK
6. Centre for Musculoskeletal Research, The University of Manchester, Faculty of Biology Medicine and Health, Manchester Academic Health Science Centre, Manchester, UK