[1] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England
[2] Bradford Hosp NHS Fdn Trust, Bradford, W Yorkshire, England
[3] Univ Toronto, Div Rheumatol, Dept Med, Toronto Western Hosp,Krembil Res Inst, Toronto, ON, Canada
[4] Univ Toronto, Toronto Western Hosp, Div Dermatol, Toronto, ON, Canada
[5] Swedish Med Ctr, Rheumatol Res, Seattle, WA USA
[6] Univ Washington, Sch Med, Seattle, WA USA
[7] QuintilesIMS, Advisory Serv, Denver, CO USA
[8] Duke Univ, Sch Med, Durham, NC USA
[9] Hofstra Northwell Sch Med, New York, NY USA
[10] Univ Penn, Med & Epidemiol, Perelman Sch Med, Philadelphia, PA 19104 USA
[11] Univ Utah, Salt Lake City, UT USA
[12] Univ Southern Calif, Los Angeles, CA USA
[13] St Vincents Univ Hosp, Dept Rheumatol, Dublin, Ireland
[14] Univ Coll Dublin, Conway Inst Biomol Res, Dublin, Ireland
[15] Univ Cagliari, Div Rheumatol, Cagliari, Italy
[16] Hosp Italiano Buenos Aires, Secc Reumatol, Serv Clin Med, Buenos Aires, DF, Argentina