[1] Keele Univ, Primary Care Ctr Versus Arthrit, Sch Med, Keele ST5 5BG, Staffords, England
[2] Musculoskeletal Res Int, Key Biscayne, FL USA
[3] Griffith Univ, Sch Hlth Sci & Social Work, Brisbane, Australia
[4] Royal Brisbane & Womens Hosp, Physiotherapy Dept, Brisbane, Australia
[5] Univ Sydney, Kolling Inst, Fac Med & Hlth, Sydney Musculoskeletal Hlth, Sydney, NSW, Australia
[6] Royal North Shore Hosp, Rheumatol Dept, Northern Sydney Local Hlth Dist, Northern Sydney Local Hlth Dist, Sydney, NSW, Australia
[7] Univ Melbourne, Melbourne Sch Hlth Sci, Physiotherapy Dept, Melbourne, Vic, Australia
[8] Keele Univ, Primary Care Ctr Versus Arthrit, Sch Med, Res UsersGroup, Keele ST5 5BG, Staffords, England
[9] Auckland Univ Technol, Sch Clin Sci, Auckland, New Zealand
[10] Univ Med Ctr Rotterdam, Erasmus MC, Dept Gen Practice, Rotterdam, Netherlands
[11] Midlands Partnership Univ NHS Fdn Trust, Haywood Hosp, Haywood Acad Rheumatol Ctr, Burslem ST6 7AG, Staffs, England
[12] Keele Univ, Sch Med, Keele ST5 5BG, Staffords, England