Leflunomide discontinuation in rheumatoid arthritis and influence of associated disease-modifying anti-rheumatic drugs: a survival analysis. - Rodriguez-Rodriguez, L; Jover-Jover, JA; Fontsere, O; Peña-Blanco, RC; León, L; Fernández-Gutierrez, B; Abásolo, L (Scandinavian Journal of Rheumatology, 2013)