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Contributors All authors made a substantial contribution as follows: GP: first draft and literature search: FC: design and concept: RC: second revision of manuscript: RDB: Language review: MC: first revision of manuscript: FEA: supervision and final version approval.
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; internally peer reviewed.
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