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Freda MC, Chazotte C, Bernstein P, Harrison E; March of Dimes Preconception Working Group.Freda MC, et al. Among authors: chazotte c.Obstet Gynecol. 2002 Feb;99(2):301-6. doi: 10.1016/s0029-7844(01)01729-x.Obstet Gynecol. 2002.PMID: 11814512