Footnotes

• X @taylor_ntaylor, @antonywillman

• Contributors NT contributed to design, concept, data collection, analysis and write-up. ASW contributed to data analysis, write-up and final edit. RMG contributed to design, concept and data and reviewed the final draft. ME contributed to data analysis and write-up.

• 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; externally peer reviewed.