[1] Hosp Virgen del Puerto, Rheumatol Unit, Plasencia, Spain
[2] Hosp Univ Virgen Macarena, Rheumatol Unit, Seville, Spain
[3] Hosp Merida, Rheumatol Unit, Merida, Spain
[4] Hosp St Joan dAlacant, Rheumatol Unit, St Juan De Alicante, Spain
[5] Hosp Gen Univ Valencia, Rheumatol Unit, Valencia, Spain
[6] Hosp Univ Clin Barcelona, Rheumatol Unit, Barcelona, Spain
[7] Hosp Univ La Paz, Rheumatol Unit, Madrid, Spain
[8] Hosp Univ Reina Sofia, Rheumatol Unit, Cordoba, Spain
[9] Hosp Gen Elda, Rheumatol Unit, Alicante, Spain
[10] Hosp Parc Tauli, Rheumatol Unit, Sabadell, Spain
[11] InMusc SL, Inst Salud Musculoesquelet, Ofelia Nieto 10-2 B, Madrid 28039, Spain
[12] Hosp Univ Virgen de la Arrixaca, Rheumatol Unit, Murcia, Spain
[13] Hosp Virgen de la Vega, Rheumatol Unit, Salamanca, Spain
[14] Hosp Univ Puerta del Hierro, Rheumatol Unit, Madrid, Spain
[15] Hosp Univ Cent Asturias, Rheumatol Unit, Oviedo, Spain
[16] Hosp Virgen de las Nieves, Radiol Unit, Granada, Spain
[17] Hosp Doctor Negrin, Rheumatol Unit, Las Palmas Gran Canaria, Spain
[18] IDIBELL, Hosp Univ Bellvitge, Rheumatol Unit, Barcelona, Spain
[19] Hosp Univ Guadalajara, Rheumatol Unit, Guadalajara, Spain
[20] Hosp Monte Naranco, Rheumatol Unit, Oviedo, Spain
[21] Hosp Univ Fdn Alcorcon, Rheumatol Unit, Alcorcon, Spain