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Contributors LG and CA were responsible for the concept, date collection, search, reviewing results, manuscript editing and review oversight. SC was responsible for the revision. MLD and AP were responsible for review oversight. All authors contributed to the manuscript and all authors approved the submission.
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.
Provenance and peer review Not commissioned; externally peer reviewed.