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Competing interests MR is the current Chief Medical Officer for World Rugby and has been since 2011. SK is current Chief Medical Officer of RFU (England) and World Rugby HIA Working Group Member. JP has been a member of World Rugby Concussion Advisory Group since 2013. MM is a World Rugby HIA Working Group Member. PD works as a concussion consultant for French Rugby and is a World Rugby HIA Working Group Member.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.