Received: 6 January 2020
Accepted: 5 February 2020
First Online: 26 February 2020
Ethics approval and consent to participate
: Ethical approval is granted by the Sydney Local Health District HREC, Approval# X19–0010. Written informed consent for brain donation was provided by senior next of kin and executor of the estate.
: Consent for publication has been provided by the family of the decedents.
: AJP currently receives partial research salary funding from Sports Health Check charity. AJP has previously received partial research funding from the Australian Football League, Impact Technologies Inc., and Samsung Corporation. The remaining authors declare that they have no competing interests.