[1] Marques de Valdecilla Univ Hosp, IDIVAL, Rheumatol, Santander, Cantabria, Spain
[2] Hosp Univ Montecelo, Pontevedra, Galicia, Spain
[3] Hosp Sierrallana, Torrelavega, Cantabria, Spain
[4] Hosp Univ Cent Asturias, Oviedo, Asturias, Spain
[5] Hosp Univ Marques de Valdecilla, Santander, Cantabria, Spain
[6] Hosp Univ Marques de Valdecilla, Div Rheumatol, Immunopathol Grp, IDIVAL, Santander, Spain