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South AP, Jones DE, Hall ES, Huo S, Meinzen-Derr J, Liu L, Greenberg JM.South AP, et al.Matern Child Health J. 2012 Feb;16(2):470-8. doi: 10.1007/s10995-011-0748-2.Matern Child Health J. 2012.PMID: 21290172