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3. A quantitative assessment of plasma homocysteine as a risk factor for vascular disease: probable benefits of increasing folic acid intakes;Boushey;JAMA,1995
4. Recommendations for the use of folic acid to reduce the number of cases of spina bifida and other neural tube defects;Centers for Disease Control and Prevention;Morb. Mortal. Wkly. Rep.,1992
5. The Megaloblastic Anaemias;Chanarin,1979