Footnotes

• Twitter @dairerooney1, @neilSportDoc

• Contributors DR and NH conceived the idea and wrote the initial draft. All authors contributed and approved the final infographic and accompanying text.

• 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.