P601 Real World Evidence on the comparative effectiveness of Ustekinumab vs anti-TNF in Crohn’s disease with Propensity Score adjustment: maintenance phase results from the prospec... by Bokemeyer, B, Plachta-Danielzik, S, di Giuseppe, R, Deppe, H, Mohl, W, Teich, N, Hoffstadt, M, Schweitzer, A, von der Ohe, M, Gauss, A, Atrya, R, Krause, T, Blumenstein, I, Höchstödter, J, Hartmann, P, Schreiber, S

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