[1] Univ Oxford, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Oxford, England
[2] Univ Sheffield, Sch Hlth & Related Res, Sheffield, S Yorkshire, England
[3] Univ Oxford, Surg Intervent Trials Unit, Oxford, England
[4] Immanuel Krankenhaus Berlin, Med Ctr Rheumatol & Clin Immunol Berlin Buch, Berlin, Germany
[5] Southend Univ Hosp, Dept Rheumatol, Southend On Sea, England
[6] Hosp Southern Norway Trust, Dept Rheumatol, Kristiansand, Norway
[7] Hosp Rheumat Dis, Rheumatol, Haugesund, Norway
[8] Univ Exeter, Primary Care Dept, Exeter, Devon, England
[9] Univ Oxford, NIHR Musculoskeletal Biomed Res Unit, Oxford, England
[10] Oxford Univ Hosp NHS Fdn Trust, Dept Neuropathol & Ocular Pathol, Oxford, England
[11] Leeds Teaching Hosp NHS Trust, Dept Rheumatol, Leeds, W Yorkshire, England
[12] Oxford Radcliffe NHS Trust, Abbott Diabet Care, Oxford, England
[13] Oxford Radcliffe NHS Trust, Oxford Eye Hosp, Oxford, England
[14] Southend Univ Hosp NHS Fdn Trust, Dept Pathol, Southend On Sea, England
[15] London Sch Hyg & Trop Med, Hlth Serv Res Unit, London WC1, England