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Karriker-Jaffe KJ, Roberts SC, Bond J.Karriker-Jaffe KJ, et al.Am J Public Health. 2013 Apr;103(4):649-56. doi: 10.2105/AJPH.2012.300882. Epub 2012 Dec 13.Am J Public Health. 2013.PMID: 23237183Free PMC article.