Footnotes

• Twitter @anaicp, @lvilpin1

• Contributors AICP and LVP designed the study and made primary contributions to data collection and assisted with data collection. All authors contributed to interpretation of results and revision of manuscript, and all 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.

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