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Contributors ME, FM and TB all contributed to the concept, evidence review, content and editing of this manuscript. ME led the manuscript writing. ME, FM and TB are responsible for the overall content as guarantors.
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 Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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