Footnotes

• Twitter @dr_rachelyew, @drlauramac

• Contributors RY—data collection, data analysis, drafting and reviewing of the manuscript. LM—data analysis, drafting and reviewing of the manuscript. SB—drafting and reviewing of the manuscript. MD—data collection and reviewing of the manuscript. DD—data collection and reviewing of the manuscript. EC—data collection and reviewing of the manuscript. PS—study design, drafting and reviewing of the 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.