Indirect Treatment Comparison of the 1‐year Efficacy for Ustekinumab Versus Other Advanced Therapies in Moderate to Severe Ulcerative Colitis: 800. (October 2019) - Welty, Margaux; Mesana, Laura; Padhiar, Amie; Naessens, Dominik; Diels, Joris; Van Sanden, Suzy; Pacou, Maud