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Footnotes
Contributors All authors were involved in the study design, collection of data and analysis of results. JM wrote the manuscript, while all three authors were involved in reviewing the final version of the manuscript.
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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