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Contributors Conception of manuscript: all authors. Pathology image acquisition and processing: LH. Writing of manuscript: LM, OE. Review and approval of manuscript: all authors.
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 Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
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