[1] Hosp Univ Marques de Valdecilla, Santander, Spain
[2] Hosp Univ Marques de Valdecilla, IDIVAL, Santander, Spain
[3] Complejo Asistencial Univ Leon, Le on, Spain
[4] Hosp Univ La Princesa, Div Rheumatol, IIS Princesa, Madrid, Spain
[5] Hosp Bellvitge Princeps Espanya, Barcelona, Spain
[6] Hosp Univ Navarra, Pamplona, Spain
[7] Hosp Univ Donostia, San Sebastian, Spain
[8] Complexo Hosp Univ Vigo, Vigo, Spain
[9] Hosp Sierrallana, Torrelavega, Spain
[10] Hosp Gen Univ Alicante, Alicante, Spain
[11] Complexo Hosp Univ, Pontevedra, Spain
[12] Hosp San Cecilio, Granada, Andalucia, Spain
[13] Hosp Univ La Paz, Madrid, Spain
[14] Basurto Univ Hosp, Bilbao, Spain
[15] Hosp Univ Elda, San Vicente Del Raspeig, Spain
[16] Complejo H Univ A Coruna, La Coruna, Spain
[17] Hosp Parc Tauli, Sabadell, Spain
[18] Hosp Univ Canarias, Div Rheumatol, Santa Cruz De Tenerife, Spain
[19] Hosp Univ Marques de Valdecilla, Lugo, Spain