[1] Univ Ottawa, Ottawa Hosp Res Inst, Fac Med, Dept Internal Med,Div Rheumatol, Ottawa, ON, Canada
[2] Istanbul Medeniyet Univ, Fac Med, Dept Internal Med, Div Rheumatol, Istanbul, Turkey
[3] Complejo Hosp Torrecardenas, Dept Internal Med, Div Rheumatol, Almeria, Spain
[4] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England
[5] Univ Calif Riverside, Dept Stat, Riverside, CA 92521 USA
[6] Univ Toronto, Toronto Western Hosp, Dept Internal Med, Div Rheumatol,Krembil Res Inst,Med, Toronto, ON, Canada
[7] Univ Toronto, Womens Coll Res Inst, Womens Coll Hosp, Rheumatol, Toronto, ON, Canada
[8] Univ Ottawa, Fac Med, Dept Internal Med, Div Rheumatol, Ottawa, ON, Canada
[9] Istanbul Medeniyet Univ, Dept Internal Med, Istanbul, Turkey
[10] Leeds Teaching Hosp Trust, NIHR Leeds Biomed Res Ctr, Leeds, W Yorkshire, England