[1] Univ Penn, Rheumatol, Philadelphia, PA 19104 USA
[2] Baxalta, Cambridge, MA USA
[3] NIH, Bldg 10, Bethesda, MD 20892 USA
[4] Mayo Clin, Rochester, MN USA
[5] Cleveland Clin, Rheumatol, Cleveland, OH 44106 USA
[6] Univ Groningen, Univ Med Ctr Groningen, Rheumatol & Clin Immunol, Groningen, Netherlands
[7] Cleveland Clin, Rheumat & Immunol Dis, Cleveland, OH 44106 USA
[8] Univ Michigan, Int Med Rheum, Ann Arbor, MI 48109 USA
[9] Boston Univ, Sch Med, Rheumatol, Boston, MA 02118 USA
[10] Johns Hopkins Univ, Med, Baltimore, MD USA
[11] Hosp Special Surg, New York, NY USA
[12] Duke Univ, Rheumatol & Immunol, Durham, NC USA
[13] Harvard Med Sch, Massachusetts Gen Hosp, Rheumatol Unit, Boston, MA USA
[14] Univ Penn, Perelman Sch Med, Div Rheumatol, Philadelphia, PA 19104 USA