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Folic Acid Supplementation for the Prevention of Neural Tube Defects: An Update of the Evidence for the U.S. Preventive Services Task Force
Tracy Wolff, MD, MPH; Catherine Takacs Witkop, MD, MPH; Therese Miller, DrPH; Shamsuzzoha B. Syed, MD, MPH, DPH (Cantab)
Annals of Internal Medicine 2009;150:632-639. doi:10.7326/0003-4819-150-9-200905050-00010

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