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Oken E, Kleinman KP, Berland WE, Simon SR, Rich-Edwards JW, Gillman MW.Oken E, et al. Among authors: simon sr.Obstet Gynecol. 2003 Aug;102(2):346-51. doi: 10.1016/s0029-7844(03)00484-8.Obstet Gynecol. 2003.PMID: 12907111Free PMC article.