Second European evidence-based consensus on the diagnosis and management of ulcerative colitis Part 3: Special situations

Van Assche, G; Dignass, A; Bokemeyer, B; Danese, S; Gionchetti, P; Moser, G; Beaugerie, L; Gomollon, F; Hauser, W; Herrlinger, K; Oldenburg, B; Panes, J; Portela, F; Rogler, G; Stein, J; Tilg, H; Travis, S; Lindsay, Jo