Footnotes

• Twitter @Doctorfitz, @jennie_clough, @Phil_Harvey1

• MF, JC, PH and ER contributed equally.

• Contributors MF conceived the article concept. MF, JC, PH and ER contributed equally in the development and the writing of the article.

• 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.