[1] Inst Salud Musculoesquelet, Madrid, Spain
[2] Hosp Virgen del Naranco, Dept Rheumatol, Oviedo, Spain
[3] Hosp Univ Parc Tauli, Dept Rheumatol, Sabadell, Spain
[4] Hosp Univ Basurto, Dept Rheumatol, Bilbao, Spain
[5] Hosp Cabuenes, Dept Rheumatol, Gijon, Spain
[6] Hosp Fdn Alcorcon, Dept Rheumatol, Madrid, Spain
[7] Hosp Virgen Arrixaca, Dept Rheumatol, Murcia, Spain
[8] Hosp Reina Sofia, Dept Rheumatol, Cordoba, Spain
[9] CS Sotondrio, Sama De Langreo, Spain
[10] CS Getafe, Madrid, Spain
[11] Hosp Univ Cent Asturias, Dept Dermatol, Oviedo, Spain
[12] IIS Princesa, Hosp Univ Princesa, Dept Internal Med, Madrid, Spain
[13] Hosp Univ Parc Tauli, Dept Dermatol, Sabadell, Spain
[14] IIS Princesa, Hosp Univ Princesa, Dept Rheumatol, Madrid, Spain