[1] Univ Calif Los Angeles, David Geffen Sch, Los Angeles, CA USA
[2] Univ Zurich Hosp, CH-8091 Zurich, Switzerland
[3] Paris Descartes Univ, Rheumatol Dept A, Cochin Hosp, AP HP, Paris, France
[4] Goethe Univ Frankfurt, Frankfurt, Germany
[5] Royal Free & Univ Coll Med Sch, London, England
[6] Gen Hosp Eilbek, Eilbek, Germany
[7] Univ Calif Los Angeles, Inst Rehabil, Los Angeles, CA 90025 USA
[8] Cincinnati Childrens Hosp, Med Ctr, Cincinnati, OH USA
[9] German Arthritis Res Ctr, Berlin, Germany
[10] Med Univ Bialystok, Dept Rheumatol & Internal Med, Bialystok, Poland
[11] Univ Florence, Div Med & Rheumatol, Florence, Italy
[12] Univ Texas Hlth Sci Ctr Houston, Houston, TX USA
[13] Boston Univ, Sch Med, Boston, MA 02118 USA
[14] Univ Queensland, Brisbane, Qld 4072, Australia
[15] Deutsch Herzzentrum Berlin, Berlin, Germany
[16] Tech Univ Dresden, Fac Med, Dept Clin Pharmacol, Dresden, Germany
[17] Univ Calif San Diego, Dept Med, San Diego, CA 92103 USA
[18] Univ Michigan, Dept Internal Med, Ann Arbor, MI 48109 USA
[19] Georgetown Univ Hosp, Div Rheumatol, Washington, DC 20007 USA
[20] Stanford Univ, Div Immunol, Portola Valley, CA USA
[21] Inst Populat Hlth, Ottawa, ON, Canada
[22] Northwestern Sch Med, Feinberg Sch Med, Chicago, IL USA
[23] German Rheumatism Res Ctr, Berlin, Germany