[1] Hosp Univ 12 Octubre, Madrid, Spain
[2] Hosp Navarra, Pamplona, Spain
[3] Hosp Univ Virgen del Rocio, Div Rheumatol, Seville, Spain
[4] Hosp Univ San Cecilio, Granada, Spain
[5] Hosp Puerta Mar, Cadiz, Spain
[6] Virgen de Valme Univ Hosp, Seville, Spain
[7] Hosp Reg Univ Malaga, Malaga, Spain
[8] Lilly, Alcobendas, Spain
[9] OXON Epidemiol, Madrid, Spain
[10] Hosp Univ La Princesa, IIS Princesa, Madrid, Spain