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Tracy TS, Venkataramanan R, Glover DD, Caritis SN; National Institute for Child Health and Human Development Network of Maternal-Fetal-Medicine Units.Tracy TS, et al. Among authors: venkataramanan r.Am J Obstet Gynecol. 2005 Feb;192(2):633-9. doi: 10.1016/j.ajog.2004.08.030.Am J Obstet Gynecol. 2005.PMID: 15696014