[1] Spanish Soc Rheumatol, Res Unit, Madrid, Spain
[2] Hosp San Jorge, Huesca, Spain
[3] Hosp Miguel Servet, Rheumatol, Zaragoza, Spain
[4] Hosp Clin Barcelona, Rheumatol Serv, Barcelona, Spain
[5] Univ Hosp Principe Asturias, Immune Syst Dis, Rheumatol Dept, Madrid, Spain
[6] Hosp Univ La Princesa, IIS IP, Rheumatol Serv, Rheumatol, Madrid, Spain
[7] GEACSER, Madrid, Spain
[8] Sergas Univ Coruna UDC, CHUAC, Inst Invest Biomed A Coruna INIBIC, Serv Reumatol, La Coruna, Spain
[9] Hosp Gen Univ Alicante, Reumatol, Alicante, Spain
[10] Hosp Univ Virgen del Rocio, Rheumatol, Seville, Spain
[11] Hosp Badalona Germans Trias & Pujol, Rheumatol, Barcelona, Spain
[12] Hosp Univ Canarias, Serv Reumatol, Santa Cruz De Tenerife, Spain
[13] Hosp Clin Univ, Fdn Ramon Dominguez, Santiago De Compostela, Spain
[14] Hosp Univ Canarias, Serv Reumatol, Rheumatol, Tenerife, Spain