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Contributors CH initiated the idea, collected the data, analysed the results, wrote and reviewed the paper. CP and LA collected the data and reviewed the paper. RHC and SdR initiated the idea, analysed the results and reviewed the paper. JBP initiated the idea and reviewed the paper. ND wrote and reviewed the paper.
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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