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Conde-Agudelo A, Nieto A, Rosas-Bermudez A, Romero R.Conde-Agudelo A, et al.Am J Obstet Gynecol. 2013 Jul;209(1):40.e1-40.e17. doi: 10.1016/j.ajog.2013.03.015. Epub 2013 Mar 15.Am J Obstet Gynecol. 2013.PMID: 23507545Free PMC article.Review.