[1] Hosp Univ Marques Valdecilla, IDIVAL, Div Rheumatol, Ave Valdecilla S-N, Santander 39008, Cantabria, Spain
[2] Univ Cantabria, Sch Med, Div Epidemiol & Computat Biol, Santander, Spain
[3] IDIVAL Spain, CIBERESP, Santander, Spain
[4] Hosp Comarcal, Div Rheumatol, Laredo, Cantabria, Spain
[5] Hosp Lucus Augusti, Div Cardiol, Lugo, Spain