. Dept and . Rheumatology, 3 Referral Center for Systemic Autoimmune Diseases, University of Milan, Italy. 4 Instituto de Parasitología y Biomedicina, CSIC, Granada, Spain. 5 Rheumatic Diseases Centre, Hospital 12 de Octubre

M. Servicio-de, H. Interna, . Xeral-calde, . Lugo, and . Spain, 12 Servicio de Reumatologia, Hospital Marques de Valdecillas The Netherlands. 15 Dept. of Immunology and Infectious Diseases, 13 Servizio di Reumatologia ed Immunologia Clinica, Spedali Civili