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Oken E, Ning Y, Rifas-Shiman SL, Radesky JS, Rich-Edwards JW, Gillman MW.Oken E, et al.Obstet Gynecol. 2006 Nov;108(5):1200-7. doi: 10.1097/01.AOG.0000241088.60745.70.Obstet Gynecol. 2006.PMID: 17077243Free PMC article.