Footnotes

• Contributors NC and DR conceived the idea to write the article. All authors had significant input in writing the article, reviewing drafts and approving the final version.

• Competing interests NC is funded by Crohn’s and Colitis UK for a clinical research fellowship. All other authors declare no competing interests.

• Provenance and peer review Not commissioned; externally peer reviewed.

• Patient consent for publication Parental/guardian consent obtained.