[1] Univ Adelaide, Dept Med, Adelaide, SA, Australia
[2] Hosp Special Surg, Med, 535 E 70th St, New York, NY 10021 USA
[3] Univ Adelaide, Med, Adelaide, SA, Australia
[4] Queen Elizabeth Hosp, Rheumatol, Woodville, SA, Australia
[5] Univ Leeds, Leeds Musculoskeletal Biomed Res Unit, NIHR, Leeds, W Yorkshire, England
[6] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England