[1] Univ Copenhagen, Parker Inst, Bispebjerg & Frederiksberg Hosp, Copenhagen, Denmark
[2] Bispebjerg & Frederiksberg Hosp, Parker Inst, Sect Biostat & Evidence Based Res, Copenhagen, Denmark
[3] Univ Southern Denmark, Odense Univ Hosp, Dept Clin Res, Res Unit Rheumatol, Odense, Denmark
[4] Univ Otago, Dept Med, Christchurch, New Zealand
[5] Univ Copenhagen, Herlev & Gentofte Hosp, Dept Radiol, Copenhagen, Denmark
[6] Leiden Univ, Med Ctr, Dept Rheumatol, Leiden, Netherlands
[7] Leiden Univ, Med Ctr, Dept Clin Epidemiol, Leiden, Netherlands
[8] Diakonhjemmet Hosp, Ctr Treatment Rheumat & Musculoskeletal Dis REMED, Oslo, Norway
[9] Univ Coll Dublin, Sch Med & Med Sci, Dublin, Ireland
[10] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England
[11] Leeds Biomed Res Ctr, Natl Inst Hlth & Care Res, Leeds, W Yorkshire, England
[12] Univ Copenhagen, Ctr Rheumatol & Spine Dis, Rigshosp, Copenhagen, Denmark
[13] Univ Calif Los Angeles UCLA, David Geffen Sch Med, Div Rheumatol & Immunol, Los Angeles, CA USA
[14] Lausanne Univ Hosp, Lausanne, Switzerland
[15] Univ Lausanne, Dept Diagnost & Intervent Radiol, Lausanne, Switzerland
[16] Univ Copenhagen, Dept Radiol, Bispebjerg & Frederiksberg Hosp, Copenhagen, Denmark