Footnotes

• Twitter @FabioSarto3, @PorcelliSimone

• Contributors GM and SP conceived the article. All authors contributed in writing the article. All authors have commented, revised and approved the article in its final form before submission to the British Journal of Sports Medicine.

• 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.

• Patient consent for publication Not required.

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