Footnotes

• Twitter @Robert_Mann_, @@BryanCClift, @@JulesBoykoff, @@shereebekker

• Contributors RM, SB and BC were responsible for the initial concept. RM wrote the first draft of the manuscript, with SB and BC making initial revisions. All other revisions by RM were circulated and commented on by SB, BC and JB. 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 None declared.

• Patient consent for publication Not required.

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