Footnotes

• Twitter @imichellefarrar

• Contributors MAF and MK planned, drafted and revised the manuscript. All authors read and approved the submitted version.

• 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 Commissioned; internally peer reviewed.