Presentation and surgical interventions for Crohn's disease with perianal fistula in the biologics era: results from a multicentre study

Black, C; Pugliese, D; Sahnan, K; Armuzzi, A; Elkady, Sm; Hart, Al; Katsanos, Kh; Christodoulou, Dk; Selinger, C; Maconi, G; Fiorino, G; Davidov, Y; Kopylov, U; Ben-Horin, S; Navarro, P; Bosca-Watts, Mm; Muscat, M; Ellul, P; Karmiris, K; Allgar, V; Danese, S; Fearnhead, Ns; Sebastian, S