[1] Hosp Guadalajara, Dept Reumatol, Guadalajara 19002, Spain
[2] Univ Alcala, Dept Med & Especialidades Med, Madrid 28805, Spain
[3] Hosp Univ Virgen Macarena, Dept Reumatol, Seville 41009, Spain
[4] Hosp Univ St Pau, Dept Reumatol, Barcelona 08025, Spain
[5] Hosp Dos Maig, Barcelona 08025, Spain
[6] Univ Autonoma Barcelona UAB, Med Fac, E-08193 Barcelona, Spain