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Milne E, Simpson JA, Johnston R, Giles-Corti B, English DR.Milne E, et al. Among authors: simpson ja.Am J Public Health. 2007 Feb;97(2):306-10. doi: 10.2105/AJPH.2005.080499. Epub 2006 Dec 28.Am J Public Health. 2007.PMID: 17194858Free PMC article.Clinical Trial.