Footnotes

• Twitter @clairelgranger

• Contributors CLG, RT and CA were responsible for the original concept for the article. CLG wrote the initial manuscript. RT and CA were both involved in editing and rewriting.

• 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.