[1] Swedish Med Ctr, Dept Rheumatol, Seattle, WA USA
[2] Univ Washington, Seattle, WA 98195 USA
[3] AbbVie Inc, N Chicago, IL USA
[4] Yale Univ, Sch Med, New Haven & Cent Connecticut Dermatol, 333 Cedar St, Cromwell, CT USA
[5] Osaka Minami Med Ctr, Natl Hosp Org, Dept Orthopaed Rheumatol, Osaka, Japan
[6] Lariboisiere Hosp, Dept Rheumatol, Paris, France
[7] Ghent Univ Hosp, Dept Internal Med, Ghent, Belgium