[1] Hosp Univ Mostoles, Rheumatol, Mostoles, Spain
[2] Hosp Univ Guadalajara, Guadalajara, Spain
[3] Hosp Univ Fdn Alcorcon, Madrid, Spain
[4] Hosp Univ Severo Ochoa, Madrid, Spain
[5] Hosp Univ Clin San Carlos, Madrid, Spain
[6] CS La Rivota, Madrid, Spain
[7] Hosp Univ La Princesa, IIS La Princesa, Rheumatol, Madrid, Spain
[8] Hosp Univ Puerta Hierro, Madrid, Spain
[9] Hosp Univ Ramon y Cajal, Madrid, Spain
[10] Hosp Univ Puerta Hierro, Rheumatol, Madrid, Spain
[11] Hosp 12 Octubre, Serv Reumatol, Madrid, Spain
[12] Hosp Univ Henares, Madrid, Spain