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Contributors ABeG and AD wrote the manuscript. SB and AA performed and reported the cross-sectional imaging. AA, JR and MM reviewed and edited the manuscript. All authors approved the manuscript prior to submission.
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; internally peer reviewed.
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