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Contributors LMB, RP-D, JW, JPFC-D and MRS designed and conducted the study. MRS wrote the statistical analysis plan, analysed the data and drafted the manuscript. All authors contributed to data interpretation and revision of the manuscript. MRS is guarantor.
Funding Financial support for the submitted work from the Foundation for Children (#2009-161). MRS received support from NHMRC fellowships (#418598, #1004474). Funding bodies had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, and approval of the manuscript.
Competing interests None.
Ethics approval RWH Human Research Ethics Committee.
Provenance and peer review Not commissioned; externally peer reviewed.
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