Footnotes

• Contributors KL contributed to planning and reporting of the work and is overall responsible for the content. JS contributed to the planning of the work. AJM contributed to the reporting of the work.All three authors finalised the article prior to submission.

• 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; externally peer reviewed.

• Data sharing statement All data relevant to the study are included in the article or uploaded as supplementary information.

• Patient consent for publication Not required.