Ruiz-Irastorza, G., Garcia, M., Espinosa, G., Caminal, L., Mitjavila, F., Gonzalez-Leon, R., Sopena, B., Canora, J., Villalba, M. V., Rodriguez-Carballeira, M., Lopez-Dupla, J. M., Callejas, J. L., Castro, A., Tolosa, C., Sanchez-Garcia, M. E., Perez-Conesa, M., Navarrete-Navarrete, N., Rodriguez, A. P., Herranz, M. T., Pallares, L., RELES, Autoimmune Dis Study Grp GEAS, [Ruiz-Irastorza, G.] Univ Basque Country, Autoimmune Dis Res Unit, Dept Internal Med, BioCruces Hlth Res Inst,Hosp Univ Cruces, Baracaldo, Bizkaia, Spain, [Garcia, M.] Univ Basque Country, Autoimmune Dis Res Unit, Dept Internal Med, BioCruces Hlth Res Inst,Hosp Univ Cruces, Baracaldo, Bizkaia, Spain, [Espinosa, G.] Hosp Clin Barcelona, Dept Autoimmune Dis, Barcelona, Spain, [Caminal, L.] Hosp Univ Cent Asturias, Dept Internal Med, Oviedo, Asturias, Spain, [Mitjavila, F.] Hosp Univ Bellvitge, Dept Internal Med, Autoimmune Dis Unit, Barcelona, Spain, [Gonzalez-Leon, R.] Hosp Univ Virgen del Rocio, Dept Internal Med, Seville, Spain, [Sopena, B.] Complejo Hosp Univ Vigo, Dept Internal Med, Vigo, Spain, [Canora, J.] Hosp Univ Fuenlabrada, Dept Internal Med, Madrid, Spain, [Villalba, M. V.] Hosp Gen Univ Gregorio Maranon, Dept Internal Med, Madrid, Spain, [Rodriguez-Carballeira, M.] Hosp Univ Mutua Terrasa, Dept Internal Med, Barcelona, Spain, [Lopez-Dupla, J. M.] Hosp Univ Joan XXIII, Dept Internal Med, Tarragona, Spain, [Callejas, J. L.] Hosp Univ San Cecilio, Dept Internal Med, Granada, Spain, [Castro, A.] Hosp Univ St Joan de Reus, Dept Internal Med, Tarragona, Spain, [Tolosa, C.] Corporacio Sanitaria Parc Tauli, Dept Internal Med, Barcelona, Spain, [Sanchez-Garcia, M. E.] Hosp Univ Reina Sofia, Dept Internal Med, Autoimmune Dis Unit, Cordoba, Spain, [Perez-Conesa, M.] Hosp Univ Miguel Servet, Dept Internal Med, Zaragoza, Spain, [Navarrete-Navarrete, N.] Hosp Univ Virgen de las Nieves, Dept Internal Med, Granada, Spain, [Rodriguez, A. P.] Complejo Hosp Univ Ourense, Dept Internal Med, Orense, Spain, [Herranz, M. T.] Hosp JM Morales Meseguer, Dept Internal Med, Murcia, Spain, [Pallares, L.] Hosp Univ Son Espases, Dept Internal Med, Islas Baleares, Spain, Spanish Society of Internal Medicine, RELES, Autoimmune Diseases Study Group (GEAS), [Ruiz-Irastorza,G, Garcia,M] Autoimmune Diseases Research Unit, Department of Internal Medicine, BioCruces Health Research Institute, Hospital Universitario Cruces, University of the Basque Country, Barakaldo, Bizkaia, Spain. [Espinosa,G] Department of Autoimmune Diseases, Hospital Clinic, Barcelona, Spain. [Caminal,L] Department of Internal Medicine, Hospital Universitario Central de Asturias, Oviedo, Asturias , Spain. [Mitjavila,F] Autoimmune Diseases Unit, Department of Internal Medicine, Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain. [González-León,R] Department of Internal Medicine , Hospital Universitario Virgen del Rocío, Sevilla, Spain. [Sopeña,B] Department of Internal Medicine, Complejo Hospitalario Universitario de Vigo, Pontevedra, Vigo , Spain. [Canora,J] Department of Internal Medicine, Hospital Universitario Fuenlabrada, Fuenlabrada, Madrid , Spain. [Villalba,MV] Department of Internal Medicine, Hospital General Universitario Gregorio Marañón, Madrid, Spain. [Rodríguez-Carballeira,M] Department of Internal Medicine, Hospital Universitario Mutua de Terrasa, Barcelona, Spain. [López-Dupla,JM] Department of Internal Medicine, Hospital Universitario Joan XXIII, Tarragona, Spain. [Callejas,JL] Department of Internal Medicine, Hospital Universitario San Cecilio, Granada, Spain. [Castro,A] Department of Internal Medicine, Hospital Universitario Sant Joan de Reus, Reus, Tarragona , Spain. [Tolosa,C] Department of Internal Medicine, Corporació Sanitària Parc Taulí, Sabadell, Barcelona, Spain. [Sánchez-García,ME] Department of Internal Medicine, Autoimmune Diseases Unit, Hospital Universitario Reina Sofía , Córdoba, Spain. [Pérez-Conesa,M] Department of Internal Medicine, Hospital Universitario Miguel Servet, Zaragoza, Spain. [Navarrete-Navarrete,N] Department of Internal Medicine , Hospital Universitario Virgen de las Nieves, Granada, Spain. [Rodríguez,AP] Department of Internal Medicine, Complejo Hospitalario Universitario de Ourense, Ourense, Spain. [Herranz,MT] Department of Internal Medicine, Hospital J.M. Morales Meseguer, Murcia, Spain. [Pallarés,L] Department of Internal Medicine, Hospital Universitario Son Espases, Palma de Mallorca, Islas Baleares, Spain., and This study was supported by the Spanish Society of Internal Medicine.