[1] Univ Hosp Parc Tauli, Rheumatol, Sabadell, Spain
[2] Hosp Santa Creu & Sant Pau, Internal Med, Barcelona, Spain
[3] Hosp Univ San Juan de Alicante, Rheumatol, Alicante, Spain
[4] Hosp Clin Univ Santiago de Compostela, Rheumatol, Santiago De Compostela, Spain
[5] Hosp Univ Princesa, Rheumatol, Madrid, Spain
[6] Hosp Univ Nuestra Senora de Valme, Rheumatol, Seville, Spain
[7] Fdn Jimenez Diaz, Rheumatol, Madrid, Spain