1. Factors affecting the ambulator status of patients with spina bifida cystica;Asher;J Bone Joint Surg Am,1983
2. Interim CDC recommendations for folic acid supplementation for women who have had an infant or fetus with spina bifida, anencephaly, or encephalocele;Centers for Disease Control;MMWR,1992
3. 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;MMWR,1992
4. Use of folic acid for prevention of spina bifida and other neural tube defects–1983–1991;Centers for Disease Control;MMWR,1991
5. Prevention of the first occurrence of neural-tube defects by periconceptional vitamin supplementation;Czeizel;N Engl J Med,1992