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Contributors WK provided the concept and idea of the article. WK and J-LH contributed equally to consecutive drafts, which were reviewed and edited by TR for important intellectual content, with continued input from WK and J-LH. All authors approved the final version.
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; externally peer reviewed.
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