Corrigendum.
In the paper, ‘Systematic analysis of factors associated with progression and regression of ulcerative colitis in 918 patients’, published in Volume 42 Issue 5 (September 2015). In Figure 3 the header and y-axis should read ‘Cumulative probability of UC regression’ and ‘Kaplan–Meier curve for UC regression’, respectively. The correct figure 3 is shown below. The authors apologise for this error.