Footnotes

• X @michaelchaiton

• Contributors MOC: conceptualisation, contributed to drafting, funding, data analysis, final evaluation. SS: conceptualisation, contributed to drafting, final evaluation. JD: conceptualisation, contributed to drafting, data analysis, final evaluation. RS: conceptualisation, contributed to drafting, funding, final evaluation.

• 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 No, there are no competing interests.

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