Footnotes

• Twitter @CameronMGee, @Tnightingale10, @DrCRWest

• CMG and TEN contributed equally.

• Contributors We confirm that ICMJE recommendations pertaining to authorship credit were followed; substantial contributions to the conception or design of the work, or the acquisition, analysis or interpretation of data, and drafting the work or revising it critically for important intellectual content. Final approval of the version submitted/published has been agreed by all authors.

• 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 AK has previously consultant for the IPC.

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