Correction to: Nature Microbiology https://doi.org/10.1038/s41564-018-0306-4, published online 10 December 2018.

In the Supplementary Tables 2, 4 and 6 originally published with this Article, the authors mistakenly included sample identifiers in the form of UMCGs rather than UMCG IBDs in the validation cohort; this has now been amended.