共 3 条
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10th Edition. Recommended Dietary Allowances. . 1989
[2]
Prevention of neural tube defects: results of the Medical Research Council Vitamin Study. MRC Vitamin Study Research Group. The Lancet . 1991
[3]
Recommendations for the use of folic acid to reduce the number of cases of spina bifida and other neural tube defects. CDC. MMWR Recommendations and Reports . 1992