[1] CSIC, Inst Parasitol & Biomed Lopez Neyra, Consejo Super Invest Cient, Granada 18100, Spain
[2] Hosp Gen Valle Hebron, Med Interna Serv, Barcelona, Spain
[3] Osped Maggiore Policlin, Fdn IRCCS Ca Granda, Referral Ctr System Autoimmune Dis, Milan, Italy
[4] Univ Milan, Milan, Italy
[5] Radboud Univ Nijmegen, Med Ctr, Dept Rheumatol, NL-6525 ED Nijmegen, Netherlands
[6] Hosp Clin Univ, Med Interna Serv, Granada, Spain
[7] Hosp Clin Barcelona, Serv Enfermedades Autoinmunes, Barcelona, Spain
[8] Hosp 12 Octubre, Serv Reumatol, E-28041 Madrid, Spain
[9] Hosp Carlos Haya, Med Interna Serv, Malaga, Spain
[10] Hosp Clin San Carlos, Serv Reumatol, Madrid, Spain
[11] Hosp Univ Mutua Terrasa, Med Interna Serv, Barcelona, Spain
[12] Hosp Virgen del Rocio, Med Interna Serv, Seville, Spain
[13] Hosp Gen Univ Gregorio Maranon, Serv Reumatol, Madrid, Spain
[14] Hosp Univ Canarias, Serv Reumatol, Tenerife, Spain
[15] Hosp Univ Miguel Servet, Med Interna Serv, Zaragoza, Spain
[16] Hosp Cruces, Med Interna Serv, Baracaldo, Spain
[17] Lund Univ, Dept Rheumatol, Lund, Sweden
[18] Karolinska Inst, Stockholm, Sweden
[19] Oslo Univ Hosp, Dept Rheumatol, Rikshosp, Oslo, Norway
[20] Catholic Univ Louvain, Clin Univ St Luc, Dept Rheumatol, B-1200 Brussels, Belgium
[21] Univ Ghent, Dept Rheumatol, B-9000 Ghent, Belgium
[22] Katholieke Univ Leuven, Dept Rheumatol, Louvain, Belgium
[23] Ruhr Univ Bochum, Dept Dermatol Venereol & Allergol, Bochum, Germany
[24] Charite, Dept Rheumatol & Clin Immunol, Berlin, Germany
[25] Hannover Med Sch, D-3000 Hannover, Germany
[26] Univ Cologne, Dept Dermatol, D-5000 Cologne, Germany
[27] Vrije Univ Amsterdam Med Ctr, Dept Rheumatol, Amsterdam, Netherlands
[28] Leiden Univ, Med Ctr, Dept Rheumatol, Leiden, Netherlands
[29] Univ Verona, Dept Med, I-37100 Verona, Italy
[30] Spedali Civil Brescia, Serv Reumatol Immunol Clin, Brescia, Italy
[31] Univ Glasgow, Div Canc Sci & Mol Pathol, Dept Surg, Glasgow, Lanark, Scotland
[32] Newcastle Univ, James Cook Univ Hosp, Middlesbrough & Inst Cellular Med, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[33] Royal Free & Univ Coll, Sch Med, Ctr Rheumatol, London, England
[34] Univ Manchester, Arthrit Res UK Epidemiol Unit, Manchester Acad Hlth Sci Ctr, Manchester, Lancs, England
[35] Univ Med Ctr Utrecht, Sect Complex Genet, Dept Med Genet, Utrecht, Netherlands
[36] Univ Granada, Escuela Univ Ciencias Salud, Granada, Spain