Systematic review and meta-analysis of the efficacy and safety of leflunomide and methotrexate in the treatment of rheumatoid arthritis Roberto Alfaro-Lara, Hector Fabricio Espinosa-Ortega, César Alejandro Arce-Salinas

Efficacy of Leflunomide 100mg Weekly Compared to Low Dose Methotrexate in Patients With Active Rheumatoid Arthritis. Double Blind, Randomized Clinical Trial Jorge Jaimes-Hernández, Claudia Irene Meléndez-Mercado, Angélica Mendoza-Fuentes, Pablo Aranda-Pereira, Gilberto Castañeda-Hernández

Visceral leishmaniasis in a patient with rheumatoid arthritis treated with methotrexate Jesús Loarce-Martos, Sandra Garrote-Corral, Francesca Gioia, Javier Bachiller-Corral