IN THIS ARTICLE

Citations

1. Food and Nutrition Board, Institute of Medicine (2008). Dietary reference intakes (DRIs): Recommended intakes for individuals, vitamins. In LK Mahan, S Escott-Stump, eds., Krause's Food and Nutrition Therapy, 12th ed. St Louis: Saunders Elsevier.

2. U.S. Preventive Services Task Force (2009). Folic acid for the prevention of neural tube defects. Available online: http://www.ahrq.gov/clinic/uspstf09/folicacid/folicacidrs.htm.

3. Cunningham FG, et al. (2010). Multifetal gestation. In Williams Obstetrics, 23rd ed., pp. 859–889. New York: McGraw-Hill.

4. Cunningham FG, et al. (2010). Prenatal care. In Williams Obstetrics, 23rd ed., pp. 189–214. New York: McGraw-Hill.

5. U.S. Department of Agriculture, Agricultural Research Service (2010). Nutrient data laboratory. USDA National Nutrient Database for Standard Reference, Release 23. Available online: http://www.ars.usda.gov/ba/bhnrc/ndl.

6. Office of Dietary Supplements, National Institutes of Health (2010). Dietary Supplement Fact Sheet: Folate. Available online: http://ods.od.nih.gov/factsheets/Folate-HealthProfessional.

Other Works Consulted

• Finger LB, Henshaw SK (2006). Disparities in rates of unwanted pregnancy in the United States, 1994 and 2001. Perspectives on Sexual and Reproductive Health, 38(2): 90–96.