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Tozer, P., Rayment, N., Al-Hassi, O. H., Murguranathan, A., Daulatzai, N., Knight, S. C., Phillips, R. K., Whelan, K., & Hart, A. L. (n.d.). tHe rectal mucosa in patients with crohn's anal fistulae harbours lower numbers of bifidobacteria, and the fistula tracts are devoid of a microbial ecosystem. Gut, 60, A221. http://access.bl.uk/ark:/81055/vdc_100135160128.0x000045