Efficacy of ustekinumab, vedolizumab, or a second anti-TNF agent after the failure of a first anti-TNF agent in patients with Crohn’s disease: a multicentre retrospective study by Rayer Cassandra, Maria Nachury, Bourreille Arnaud, Roblin Xavier, Peyrin-Biroulet Laurent, Viennot Stephanie, Flamant Mathurin, Laharie David, Caron Bénédicte, Dewitte Marie, Siproudhis Laurent, Fumery Mathurin, Bouguen Guillaume

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