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Contributors JJM wrote the original draft of this article. JHM and SRK provided the enclosed images. All authors contributed to the final edit of the piece.
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.
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