Footnotes

• Contributors MJC drafted the manuscript. MAM and GL suggested revisions. All authors read and approved the final manuscript.

• 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 GL is the editor-in-chief of the journal Pilot and Feasibility Studies.

• Patient consent for publication Not required.

• Provenance and peer review Not commissioned; internally peer reviewed.