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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.