Folic acid supplements during early pregnancy and likelihood of multiple births: a population-based cohort study.
Li Z; Gindler J; Wang H; Berry RJ; Li S; Correa A; Zheng JC; Erickson JD; Wang Y; Lancet (London, England), 2003, vol. 361, issue 9355, p 380, ISSN 01406736. ISBN 01406736.

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