[1] Principe Asturias Hosp, Immune Syst Dis Rheumatol Serv, Alcala De Henares, Spain
[2] Infanta Sofia Hosp, SER Res Unit, Madrid, Spain
[3] Infanta Sofia Hosp, Rheumatol Dept, Madrid, Spain
[4] Puerta de Hierro Hosp, Rheumatol Dept, Madrid, Spain
[5] Marques de Valdecilla Hosp, Rheumatol Dept, Santander, Spain
[6] Germans Trias & Pujol Hosp, Rheumatol Dept, Barcelona, Spain
[7] Marina Baixa Hosp, Rheumatol Dept, Alicante, Spain