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Contributors OAAE: involved in carrying out the literature review, drafting the manuscript and in the final approval and submission for publication. JM: involved in drafting the manuscript, revising the draft, final approval and the submission for publication.
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.