[1] Bristol Royal Infirm & Gen Hosp, Rheumatol, Bristol, Avon, England
[2] Leeds Teaching Hosp NHS Trust, Leeds Biomed Res Ctr, Leeds, W Yorkshire, England
[3] Univ West England, Fac Hlth & Appl Sci, Bristol, Avon, England
[4] Univ Hosp Bristol & Weston NHS Fdn trust, Acad Rheumatol, Bristol, Avon, England
[5] Univ Oxford, Nuffield Dept Populat Hlth, Oxford, England
[6] Univ Adelaide, Discipline Med, Adelaide, SA, Australia
[7] Royal Adelaide Hosp, Rheumatol Unit, Adelaide, SA, Australia
[8] Weill Cornell Med, Hosp Special Surg, Div Rheumatol, New York, NY USA
[9] Univ Leeds, Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England