[1] Univ Complutense Madrid, Hosp Gen Univ Gregorio Maranon, Inst Invest Sanitaria Gregorio Maranon, Serv Reumatol,Dept Med, C Dr Esquerdo 46, Madrid 28007, Spain
[2] Hosp Reg Malaga, Enfermeria Reumatol, Malaga, Spain
[3] Hosp Clin Univ Navarra, Serv Reumatol, Madrid, Spain
[4] Hosp Sagunto, Farm Hosp, Valencia, Spain
[5] Hosp 12 Octubre, Serv Reumatol, Madrid, Spain
[6] Hosp del Mar, Serv Reumatol, Barcelona, Spain
[7] GlaxoSmithKline, Madrid, Spain
[8] Outcomes 10, Castellon de La Plana, Spain
[9] Hosp Univ Virgen del Rocio, Serv Reumatol, Seville, Spain