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Contributors NT and AMcN collected the data and analysed these. The first draft was written by NT. CLC and AMcN reviewed the manuscript. All the authors were involved in the concept and design of the study, were involved in the interpretation of the data and writing of the manuscript, and approved 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.
Provenance and peer review Not commissioned; internally peer reviewed.