[1] Hosp Univ Marques Valdecilla, IFIMAV, Epidemiol Genet & Atherosclerosis Res Grp Syst In, Div Rheumatol, Santander, Spain
[2] Hosp Univ San Cecilio, Dept Med, Granada, Spain
[3] Hosp Univ Princesa, IIS Princesa, Rheumatol Dept, Madrid, Spain
[4] Univ Cantabria, Sch Med, Dept Epidemiol & Computat Biol, Santander, Spain
[5] IFIMAV, CIBERESP, Madrid, Spain
[6] Hosp Univ Marques Valdecilla, IFIMAV, Patol Div, Santander, Spain
[7] CSIC, Inst Parasitol & Biomed Lopez Neyra, Granada, Spain
[8] Hosp Univ Lucus Augusti, Div Rheumatol, Lugo, Spain