La Montagna, G., R. Tirri, R. Vitiello, D. Malesci, R. Buono, G. Mennillo, and G. Valentini. 2006. “Safety of Methotrexate in Rheumatoid Arthritis: A Retrospective Cohort Study in Clinical Practice”. Reumatismo 58 (4):261-67. https://doi.org/10.4081/reumatismo.2006.261.