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Contributors WJU conceived and drafted the manuscript. AMC edited the manuscript. AE-D provided the imaging review and description.
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 by Anu Jacob, Liverpool, UK, and Jackie Palace, Oxford, UK.