Footnotes

• Twitter @smee_natalie, @oshea_jem

• Contributors NJS and JOS wrote the first draft of the manuscript. All authors are responsible for the reported research. All authors have participated in the concept and design; analysis and interpretation of data; and drafting or revising the manuscript. All authors have approved the manuscript as submitted.

• 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.