Footnotes

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• Contributors All authors contributed to writing this manuscript, drafting, and critical revision of this manuscript. All authors have given final approval of this version to be published, all authors accept responsibility for its contents, and all authors participated in addressing the reviewer’s comments.

• 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.