P804 Does Crohn's disease extent and behavior have an impact on ustekinumab effectiveness? A real-world multicenter retrospective study von Samarentsis, N, Kapizioni, C, Georgakopoulou, N, Michalopoulos, G, Striki, A, Karoumpalis, I, Kartsoli, S, Mellos, A, Vrakas, S, Vougadiotis, I, Neonaki, A, Karatzas, P, Tsiamperas, N, Kourikou, A, Siakavellas, S, Polymeros, D, Manolakopoulos, S, Papatheodoridis, G, Triantafyllou, K

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