Footnotes

• Twitter @dr_dee_kumar

• Contributors AK conducted the literature review and wrote the main draft of the manuscript. CN-P and CS reviewed and edited the manuscript.

• Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests AK is a trainee associate editor at Frontline Gastroenterology. CS has received unrestricted research grants from Warner Chilcott, Janssen and AbbVie, has provided consultancy to Warner Chilcott, Falk, AbbVie, Takeda, Fresenius Kabi and Janssen, and had speaker arrangements with Warner Chilcott, Falk, AbbVie, MSD, Pfizer and Takeda. CN-P had speaker arrangements with Falk, UCB, Sanofi, Alliance and Alexion.

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