Statistical methods The investigators will use this rigorously designed, prospective cohort study to explore the ability to predict clinical response across the conditions included (Y=primary endpoint), and explore whether patients who are on a diet high in fibre AND low in red and processed meat (X=assessed at baseline) is an informative prognostic factor. Per default, the statistical model will include condition (any of the CID conditions included), and clinical centre (site #1 to #8) as fixed effects.