Funding for this research was provided by:
National Health and Medical Research Council Project grant (631055)
Received: 13 December 2018
Accepted: 2 October 2019
First Online: 15 October 2019
Ethics approval and consent to participate
: Ethics approval for this study has been obtained from the University of Newcastle Human Research Ethics Committee (HREC-2010-1002). Consent was obtained from all participants prior to commencing the survey.
: Not applicable.
: The authors declare that they have no competing interests.