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Ten Bokkel Huinink, S., van der Woude, J., Casanova, M. J., Bouguen, G., Mak, J. W. Y., Molnar, T., Seidelin, J., Aurelien, A., D'Haens, G., Riviere, P., Guidi, L., Renata, B., Lin, W. C., & de Vries, A. (n.d.). p321 Cessation of Anti-Tumour Necrosis Factor Therapy in Patients with Perianal Fistulizing Crohn's Disease: Individual Patient Data Meta-Analysis of 323 patients from 12 studies. Journal of Crohn's and colitis, 15, S347. http://access.bl.uk/ark:/81055/vdc_100130765478.0x000016