Footnotes

• Twitter @DrAlanCPsych346, @CheriBlauwetMD, @Abhinav_Bindra, @campriani, @BrianHainline, @dmcduff52, @margo.mountjoy, @Mputukian, @vgouttebarge

• Contributors AC, CB, DM, MM, RP, MP, CLR, VG: substantial contribution to conception and design; acquisition, analysis and interpretation of data; drafting the work and revising it critically; agreement to be accountable for all aspects of the work. AB, RB, NC, BH: substantial contribution to conception and design; interpretation of data; drafting the work and revising it critically; agreement to be accountable for all aspects of the work.

• 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 MP wishes to declare the following: consulting fees from Major League Soccer (USA); participation on advisory board as senior advisor, NFL (USA), Head, Neck and Spine Committee; participation on advisory board as committee member, US Soccer Medical Advisory Committee; participation on advisory board as committee member, USOPC Mental Health Task Force. All authors are members of the IOC Mental Health Working Group.

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