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Contributors AJR conceived and prepared the first draft. AJR,KR, SG and SA worked on subsequent revisions and the final manuscript. All authors assume responsibility for the final manuscript.
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.