[1] Univ Manchester, Fac Biol Med & Hlth, Ctr Epidemiol Versus Arthrit,Sch Biol Sci, Manchester Acad Hlth Sci Ctr,Div Musculoskeletal &, Manchester, England
[2] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, England
[3] Leeds Teaching Hosp Trust, NIHR Leeds Biomed Res Ctr, Leeds, England
[4] Royal Berkshire NHS Fdn Trust, Dept Rheumatol, Reading, England
[5] Leeds Teaching Hosp Trust, Dept Rheumatol, Leeds, England
[6] Northern Care Alliance NHS Fdn Trust, Salford Royal Hosp, Rheumatol Dept, Manchester, England
[7] Manchester Metropolitan Univ, Fac Hlth & Educ, Manchester, England
[8] Univ Aberdeen, Aberdeen Ctr Arthrit & Musculoskeletal Hlth, Epidemiol Grp, Aberdeen, Scotland
[9] Royal Devon & Exeter Hosp, Dept Rheumatol, Honiton Surg, Exeter, England
[10] St Georges Univ Hosp NHS Fdn Trust, Dept Rheumatol, London, England
[11] Royal United Hosp, Royal Natl Hosp Rheumat Dis, Bath, England
[12] Univ Glasgow, Sch Infect & Immun, Glasgow, Scotland
[13] Newcastle Upon Tyne Hosp NHS Fdn Trust, Rheumatol Dept, Newcastle Upon Tyne, England
[14] Natl Axial Spondyloarthritis Soc NASS, London, England
[15] Univ East Anglia, Ctr Epidemiol, Norwich Med Sch, Norwich, England
[16] Norfolk & Norwich Univ Hosp NHS Fdn Trust, Rheumatol Dept, Norwich, England
[17] Univ Manchester, Fac Biol Med & Hlth, Ctr Epidemiol Versus Arthrit, Manchester Acad Hlth Sci Ctr,Div Musculoskeletal &, Oxford Rd, Manchester M13 9LJ, England