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Sands, B. E., Peyrin-Biroulet, L., Marano, C., O'Brien, C. D., Zhang, H., Johanns, J., Szapary, P., Rowbotham, D., Leong, R. W., Arasaradnam, R. P., Danese, S., Van Assche, G., Targan, S., & Sandborn, W. J. (n.d.). p312 Efficacy in biologic failure and non-biologic-failure populations in a Phase 3 study of ustekinumab in moderate–severe ulcerative colitis: UNIFI. Journal of Crohn's and colitis, 13, S256–S257. http://access.bl.uk/ark:/81055/vdc_100092361506.0x000012