Effectiveness and safety of methotrexate monotherapy in patients with Crohn's disease refractory to anti-TNF-?: results from the ENEIDA registry - Mesonero F, Castro-Poceiro J, Benítez JM, Camps B, Iborra M, López-García A, Torres P, Esteve M, Tosca J, Bertoletti F, Almela P, Calvet X, Vera I, Bujanda L, Gomollón F, Rodríguez C, Antolín B, Busquets D, Hernández A, Rivero M, Monfort I Miquel D, Castaño-García A, Gisbert JP, Domènech E, López-Sanromán A, ENEIDA Project of GETECCU (Alimentary Pharmacology & Therapeutics, 2021)