1. P399 Higher anti-tumour necrosis factor-alpha drug levels are associated with improved radiological outcomes in patients with perianal fistulising Crohn's disease: A retrospective multi-centre study. (27th May 2021) Authors: De Gregorio, M; Lee, T; Krishnaprasad, K; Amos, G; An, Y K; Bastian-Jordan, M; Begun, J; Borok, N; Brown, D J M; Cheung, W; Connor, S; Gerstenmaier, J; Gilbert, L E; Gilmore, R; Gu, B; Kutaiba, N; Lee, A; Mahy, G; Srinivasan, A; Thin, L Journal: Journal of Crohn's and colitis Issue: Volume 15(2021)Supplement 1 Page Start: S408 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗