1 Centre for Osteoarthritis Pathogenesis Versus Arthritis, Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences (NDORMS), Oxford, University of Oxford, Oxford.
2 Centre for Inflammatory Disease, Department of Immunology and Inflammation, Imperial College London, London W12 0NN, UK.
3 Talbot Medical Centre, South Shields, Tyneside, UK.