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Contributors ME and AB contributed equally to this work (co-first authors). They drafted the article and reviewed the literature. MGH interpreted the images and helped with the literature review. TMA acted as a senior author and reviewed the article for important intellectual content.
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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