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Footnotes
Contributors SG wrote and submitted the manuscript. MAS wrote and edited the script. DHJ provided information to write the report and edited the manuscript. RPL provided the endoscopy images and wrote/edited the manuscript. UM provided the annotated histology and edited the manuscript. All authors have read and approved this submission.
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 RPL has received educational grants from Ferring, Pfizer and Vifor Pharma. MAS served as a speaker, a consultant and/or an advisory board member for Sandoz, Janssen, Takeda, MSD, Falk, Samsung Bioepis, Galapagos and Bristol-Myers Squibb. DHJ has received educational grants from Janssen, Bayer, BMS and EUSA Pharma and has served as a speaker/an advisory board member for Janssen, AstraZeneca, MSD and Pfizer.
Provenance and peer review Not commissioned; externally peer reviewed.