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Beelen, E. M. J., Oldenburg, B., van der Meulen-de Jong, A. E., Ponsioen, C. I. J., Dijkstra, G., Pierik, M. J., Hoentjen, F., de Boer, N. K. H., Erler, N. S., van der Woude, C. J., & de Vries, A. C. (n.d.). p697 Thiopurines vs. anti-TNFa for the prevention of postoperative recurrence in Crohn's disease—a meta-analysis. Journal of Crohn's and colitis, 12, S463–S464. http://access.bl.uk/ark:/81055/vdc_100095517349.0x000012