Footnotes

• Handling editor Runjan Chetty.

• Contributors All authors significantly participated in the drafting of the manuscript or critical revision of the manuscript for important intellectual content and provided approval of the final submitted version. Individual contributions are as follow: LR and MVL wrote the manuscript and interpreted data. FDG and LR performed the endoscopy, provided the images. AV and MF provided histopathological specimen. ADS made final critical revision for important intellectual contents. All authors reviewed the paper for final approval.

• 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.

• Patient consent for publication Obtained.

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