[1] Spanish Soc Rheumatol, Madrid, Spain
[2] Inst Salud Carlos III, Agencia Evaluac Tecnol Sanitarias, Madrid, Spain
[3] Hosp Univ Principe Asturias, Alcala De Henares, Madrid, Spain
[4] Hosp Clin Barcelona, Barcelona, Spain
[5] Hosp Univ La Paz, Madrid, Spain
[6] Complexo Hosp Univ Ourense, Orense, Spain
[7] Hosp Univ Salamanca, Zamora, Spain
[8] Hosp Gen Granollers, Granollers, Spain
[9] Complexo Hosp Univ A Coruna, La Coruna, Galicia, Spain
[10] Soc Espanola Reumatol, Madrid, Spain
[11] Hosp Gregorio Maranon, Madrid, Spain
[12] Hosp Gen Univ Gregorio Maranon, Madrid, Spain