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Contributors Performed surgery: RLS. Wrote abstract: PK, MRH, RLS. Reviewed the literature: PK, MRH. Pathology slides: MRH. Final review: PK, MRH, and RLS. All the authors approved the final version.
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; internally peer reviewed.