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Footnotes
Handling editor Josef S Smolen
Contributors All the authors contributed substantially to the manuscript and were involved in concept development, data collection and analyses, and manuscript drafting. All the authors have approved the final version of the manuscript and agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
Funding This work was supported by an Australian National Health and Medical Research Council (NHMRC) project grant (1041900) and an NHMRC Early Career Fellowship grant (1090759).
Competing interests None declared.
Patient consent for publication Not required.
Ethics approval The study was approved by the Clinical Ethics Committee of the Flinders Medical Centre.
Provenance and peer review Not commissioned; externally peer reviewed.