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Freedman VA, Kasper JD, Spillman BC, Agree EM, Mor V, Wallace RB, Wolf DA.Freedman VA, et al.Am J Public Health. 2014 Feb;104(2):e88-94. doi: 10.2105/AJPH.2013.301687. Epub 2013 Dec 12.Am J Public Health. 2014.PMID: 24328656Free PMC article.