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Contributors All authors conceptualised and designed the study; JD conducted statistical analyses and drafted the manuscript; CM, KE, JB and DR provided advice on data analysis and interpretation and critically reviewed the manuscript; all authors approved the final version.
Funding The study was funded by SA Government.
Competing interests None.
Ethics approval Ethics approval was provided by the University of Adelaide Human Research Ethics Committee.
Provenance and peer review Not commissioned; externally peer reviewed.
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