Folic Acid Supplementation for the Prevention of Neural Tube Defects: An Update of the Evidence for the U.S. Preventive Services Task Force.
Wolff, Tracy MD, MPH; Witkop, Catherine Takacs MD, MPH; Miller, Therese DrPH; Syed, Shamsuzzoha B. MD, MPH, DPH (Cantab)
Annals of Internal Medicine.
150(9):632-639, May 5, 2009.
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