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Contributors AS wrote the manuscript with the participation of ID. ID and AS planned the study. AS conducted a survey of the literature and composed the manuscript, aided by ID.
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 Next of kin consent obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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