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Contributors MR: conceptual idea of the manuscript, writing of the manuscript and editing of the finaldraft. ED: writing of the manuscript and editing of the final draft. FB: writing of the manuscript and editing of the final draft.
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.