[1] Inst Nacl Nutr Salvador Zubiran, Dept Immunol & Rheumatol, Mexico City 14000, DF, Mexico
[2] Hosp Pitie Salpetriere, Dept Internal Med, Paris, France
[3] Univ Utah, Hlth Sci Ctr, Dept Obstet & Gynecol, Salt Lake City, UT USA
[4] Hosp Clin Barcelona, Dept Autoimmune Dis, Inst Clin Infecc & Immunol, Barcelona, Catalonia, Spain
[5] Morehouse Sch Med, Atlanta, GA 30310 USA
[6] St Thomas Hosp, Rayne Inst, Lupus Res Unit, London SE1 7EH, England
[7] Sheba Med Ctr, Res Ctr Autoimmune Dis, Tel Hashomer, Israel
[8] Louisiana State Univ, Hlth Sci Ctr, Dept Med, Rheumatol Sect, New Orleans, LA 70112 USA
[9] Univ N Carolina, Div Rheumatol & Immunol, Chapel Hill, NC USA