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Contributors RC: corresponding author and responsible for the writing of the manuscript; MR: contributed by performing the biopsy and writing and review of the manuscript; MMB: important contribution on writing and reviewing the manuscript; JCC: performed histopathological examination and reviewed 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 None declared.
Patient consent for publication Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.