Long-term outcomes of acute severe ulcerative colitis in the rescue therapy era: A multicentre cohort study. - Festa S; Scribano ML; Pugliese D; Bezzio C; Principi M; Ribaldone DG; Allocca M; Mocci G; Bodini G; Spagnuolo R; Vernia P; Mazzuoli S; et al. (United European gastroenterology journal, 2021)