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Cook WK, Karriker-Jaffe KJ, Bond J, Lui C.Cook WK, et al.Am J Public Health. 2015 May;105(5):1020-7. doi: 10.2105/AJPH.2014.302196. Epub 2014 Nov 13.Am J Public Health. 2015.PMID: 25393183Free PMC article.