[1] Chaim Sheba Med Ctr, Zabludowicz Ctr Autoimmune Dis, Tel Aviv, Israel
[2] Tel Aviv Univ, Sackler Fac Med, IL-69978 Tel Aviv, Israel
[3] Maastricht Univ, Med Ctr, Cent Diagnost Lab, Maastricht, Netherlands
[4] Univ Groningen, Univ Med Ctr Groningen, Dept Rheumatol & Clin Immunol, Groningen, Netherlands
[5] Univ Leipzig, Inst Clin Immunol & Transfus Med, D-04109 Leipzig, Germany
[6] Sch Med, Dept Clin Immunol & Rheumatol, Hannover, Germany
[7] Med Univ Innsbruck, Rheumatol Unit, Dept Internal Med 1, A-6020 Innsbruck, Austria
[8] Univ Hosp Leuven, Louvain, Belgium
[9] Katholieke Univ Leuven, Dept Microbiol & Immunol, Louvain, Belgium
[10] GH Pitie Salpetriere, Dept Immunol, Paris, France
[11] Hosp Clin Barcelona, Dept Autoimmune Dis, Catalonia, Spain
[12] Hosp Univ Pueta Hierro Majadahonda, Serv Inmunol, Madrid, Spain
[13] S Joao Hosp, Dept Med, Autoimmune Dis Unit, Oporto, Portugal
[14] Fernando Fonseca Hosp, Autoimmun & PreNatal Diagnost Lab Unit, Oporto, Portugal
[15] Azienda Osped Osped San Carlo Borromeo, Inst Microbiol, Milan, Italy
[16] Umea Univ, Dept Clin Microbiol, Umea, Sweden
[17] Univ Hosp Orebro, Dept Lab Med, Orebro, Sweden
[18] Univ Orebro, SE-70182 Orebro, Sweden
[19] Univ Turku, Dept Med Microbiol & Immunol, Turku, Finland
[20] Kings Coll London, Div Womens Hlth, Lupus Res Lab, London WC2R 2LS, England
[21] DIA Univ Spital, Klin Immunol, Zurich, Switzerland
[22] Univ Fed Sao Paulo, Div Rheumatol, Sao Paulo, Brazil
[23] Statens Serum Inst, Dept Clin Chem & Immunol, DK-2300 Copenhagen S, Denmark
[24] Spedali Civil Brescia, Rheumatol & Clin Immunol Unit, Dept Clin & Expt Sci, I-25125 Brescia, Italy
[25] Univ Brescia, Brescia, Italy
[26] Uppsala Univ, Dept Immunol Genet & Pathol, Uppsala, Sweden
[27] Massachusetts Gen Hosp, Div Rheumatol Allergy & Immunol, Harvard, MA USA
[28] Harvard Univ, Sch Med, Harvard, MA USA
[29] Univ Calgary, Fac Med, Calgary, AB, Canada
[30] Univ Florida, Dept Oral Biol, Gainesville, FL 32610 USA
[31] Hosp Gen Occidente Seguro Social, Dept Immunol & Rheumatol, Guadalajara, Jalisco, Mexico
[32] Univ Guadalajara, Guadalajara 44430, Jalisco, Mexico
[33] Newark Beth Israel Med Ctr UMDNJ, Newark, NJ USA
[34] Newark Beth Israel Med Ctr UMDNJ, VP, Newark, NJ USA
[35] Univ Oulu, Inst Diagnost, Dept Med Microbiol & Immunol, Oulu, Finland
[36] NordLab Oulu, Oulu, Finland
[37] CH Lyon Sud, Dept Immunol, Pierre Benite, France
[38] Azienda Osped Osped San Carlo Borromeo, Clin Immunol Unit, Milan, Italy
[39] Azienda Osped Osped San Carlo Borromeo, Renal Unit, Milan, Italy
[40] Univ Milan, Div Rheumatol, Ist G Pini, Ist Auxol Italiano, Milan, Italy
[41] Tel Aviv Univ, Sackler Fac Med, Laura Schwarz Kip Chair Res Autoimmune Dis, IL-69978 Tel Aviv, Israel