[1] Univ Autonoma Madrid, Div Rheumatol, Hosp Princesa, IIS IP, C Diego Leon 62, Madrid 28006, Spain
[2] Vrije Univ Amsterdam Med Ctr, Amsterdam Rheumatol & Immunol Ctr, Reade POB 7057, NL-1007 MB Amsterdam, Netherlands
[3] Univ Cantabria, Epidemiol Genet & Atherosclerosis Res Grp System, Hosp Univ Marques de Valdecilla, IDIVAL,Rheumatol Div, Avda Valdecilla S-N, Santander 39008, Spain