Footnotes

• Contributors GS completed the oesophagogastroduodenoscopy (EGD) and performed the biopsies. IS and MM performed the analysis on the biopsies and completed the staining. MP compiled the data and wrote the manuscript. GS, IS and MM edited the manuscript. MP is the article guarantor.

• 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 None declared.

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