[1] Hosp Univ Canarias, Serv Reumatol, Tenerife, Spain
[2] Spanish Soc Rheumatol, Res Unit, Madrid, Spain
[3] Hosp Clin Barcelona, Barcelona, Spain
[4] Hosp Miguel Servet, Rheumatol, Zaragoza, Spain
[5] Hosp San Jorge, Huesca, Spain
[6] Spanish Soc Rheumatol, Unidad Invest, Madrid, Spain
[7] Hosp Virgen Macarena, Rheumatol, Seville, Spain
[8] Complejo Hosp Univ Santiago, Rheumatol, Santiago De Compostela, Spain
[9] Hosp Gran Canaria Dr Negrin, Gran Canaria, Spain
[10] Hosp Univ Valencia, Rheumatol, Valencia, Spain
[11] Hosp Gen Univ Elda, Elda, Spain
[12] Hosp Clin Univ Salamanca, Rheumatol, Salamanca, Spain
[13] UDC, Sergas, CHUAC, Serv Reumatol,Inst Invest Biomed A Coruna INIBIC, La Coruna, Spain
[14] Hosp Univ Canarias, Serv Reumatol, Santa Cruz De Tenerife, Spain
[15] Fdn Ramon Dominguez, Hosp Clin Univ, Santiago De Compostela, Spain
[16] Hosp Univ Canarias, Rheumatol, Serv Reumatol, Tenerife, Spain