[1] Johns Hopkins Univ, Sch Med, Baltimore, MD 21205 USA
[2] Univ Alabama Birmingham, Birmingham, AL USA
[3] Univ Birmingham, Birmingham, W Midlands, England
[4] Oklahoma Med Res Fdn, Oklahoma City, OK 73104 USA
[5] Univ Laval, Ctr Hosp Univ Quebec, Quebec City, PQ, Canada
[6] Manchester Acad Hlth Sci Ctr, Manchester, Lancs, England
[7] Univ Manchester, Manchester, Lancs, England
[8] UCL, London, England
[9] Cedars Sinai Med Ctr, Los Angeles, CA 90048 USA
[10] Univ Calif Los Angeles, Los Angeles, CA USA
[11] Univ Lund Hosp, S-22185 Lund, Sweden
[12] Northwestern Univ, Chicago, IL 60611 USA
[13] Hanyang Univ Hosp Rheumat Dis, Seoul, South Korea
[14] Dalhousie Univ, Halifax, NS, Canada
[15] Capital Hlth, Halifax, NS, Canada
[16] Mt Sinai Hosp, Toronto, ON M5G 1X5, Canada
[17] Univ Hlth Network, Toronto, ON, Canada
[18] McGill Univ, Ctr Hlth, Montreal, PQ, Canada
[19] Feinstein Inst Med Res, Manhasset, NY USA
[20] Allegheny Singer Res Inst, Pittsburgh, PA 15212 USA
[21] Allegheny Gen Hosp, Pittsburgh, PA 15212 USA
[22] Toronto Western Hosp, Toronto, ON M5T 2S8, Canada
[23] Univ Toronto, Toronto, ON, Canada
[24] Univ Calif San Diego, La Jolla, CA 92093 USA
[25] N Dallas Dermatol Associates, Dallas, TX USA
[26] Philadelphia VA Med Ctr, Philadelphia, PA USA
[27] Univ Penn, Philadelphia, PA 19104 USA
[28] Lanarkshire Ctr Rheumatol, E Kilbride, Lanark, Scotland
[29] Hairmyres Hosp, E Kilbride, Lanark, Scotland
[30] Hosp Univ Cruces, Baracaldo, Spain
[31] Univ Basque Country, Baracaldo, Spain
[32] Rayne Inst, London, England
[33] St Thomas Hosp, London, England
[34] Copenhagen Univ Hosp, Rigshosp, Copenhagen, Denmark
[35] NYU, New York, NY USA
[36] Ysbyty Gwynedd, Bangor, Gwynedd, Wales
[37] Univ N Carolina, Chapel Hill, NC USA
[38] Karolinska Univ Hosp, Stockholm, Sweden
[39] Suny Downstate Med Ctr, Brooklyn, NY 11203 USA
[40] Kantonsspital Schaffhausen, Schaffhausen, Switzerland
[41] Univ Manitoba, Winnipeg, MB, Canada
[42] Wake Forest Univ, Winston Salem, NC 27109 USA
[43] Univ Louisville, Louisville, KY 40292 USA
[44] Emory Univ, Atlanta, GA 30322 USA
[45] Istanbul Univ, Istanbul, Turkey
[46] Med Univ S Carolina, Charleston, SC USA
[47] Landspitali Univ Hosp, Reykjavik, Iceland
[48] Univ Texas Hlth Sci Ctr San Antonio, San Antonio, TX 78229 USA
[49] Univ Maryland, Baltimore, MD 21201 USA