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Costantine MM, Weiner SJ; Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) Maternal–Fetal Medicine Units Network (MFMU).Costantine MM, et al.Obstet Gynecol. 2009 Aug;114(2 Pt 1):354-364. doi: 10.1097/AOG.0b013e3181ae98c2.Obstet Gynecol. 2009.PMID: 19622997Free PMC article.
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