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Evenson KR, Moos MK, Carrier K, Siega-Riz AM.Evenson KR, et al.Matern Child Health J. 2009 May;13(3):364-75. doi: 10.1007/s10995-008-0359-8. Epub 2008 May 14.Matern Child Health J. 2009.PMID: 18478322Free PMC article.