Care burden and outcome of the surgical management of ulcerative colitis: A retrospective analysis of the last 20 years in a tertiary hospital in Spain Ignacio Aguirre-Allende; Jose M. Enríquez-Navascués; Garazi Elorza; Ane Etxart; Ainhoa Echeveste; Nerea Borda-Arrizabalaga; Carlos Placer; Yolanda Saralegui;