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Downey L, Tyree PT, Huebner CE, Lafferty WE.Downey L, et al. Among authors: tyree pt.Matern Child Health J. 2010 Nov;14(6):922-30. doi: 10.1007/s10995-009-0519-5.Matern Child Health J. 2010.PMID: 19760163Free PMC article.