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Hagan KA, Erekson E, Austin A, Minassian VA, Townsend MK, Bynum JPW, Grodstein F.Hagan KA, et al.Am J Obstet Gynecol. 2018 May;218(5):502.e1-502.e8. doi: 10.1016/j.ajog.2018.01.045. Epub 2018 Feb 6.Am J Obstet Gynecol. 2018.PMID: 29425839Free PMC article.