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Contributors ERR and TMcC generated the first draft of the manuscript. All authors edited manuscript drafts and WS collated all author comments to the final submitted version. The corresponding author had final responsibility for the decision to submit for publication.
Funding This study was funded by National Institute of Neurological Disorders and Stroke (http://dx.doi.org/10.13039/100000065) grant no: R01 NS094003, U54 NS115322; NHS Research Scotland; The Football Association and Professional Footballers Association.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Commissioned; internally peer reviewed.