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Contributors JA contributed to the design of the systematic review, independently reviewed the journal titles, abstracts and full-text articles; drafted and revised the manuscript; and approved the final manuscript as submitted. JO contributed to the design of the systematic review, reviewed and revised the manuscript and approved the final manuscript as submitted.
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.