Received: 13 October 2017
Accepted: 8 April 2018
First Online: 16 May 2018
Ethics approval and consent to participate
: This study did not require data collection and was solely performed using already collected data through routine data systems. Ethics review and consent were not deemed necessary based on the National Statement on Ethical Conduct in Human Research as anonymised data was used. This work was conducted in a context of a quality improvement program and therefore met criteria for operational improvement activities that exempt from ethics review in according to the policy activities that constitute research at the NSW Ministry of Health [CitationRef removed].
: The authors declare that they have no competing interests.
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