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Article History

Received: 18 May 2017

Accepted: 15 March 2018

First Online: 23 March 2018

Ethics approval and consent to participate

: Ethics approval was obtained from NSW Population & Health Services Research Ethics Committee (HREC/13/CIPHS/55). De-identified data was obtained for this study from the custodians of NSW Institute of Trauma and Injury Management (NSW Health) and AROC. They obtained their data through a process of opt-out consent.

: No applicable.

: The authors declare that they have no competing interests.

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