1. Truswell AS. ABC of nutrition. Nutrition for pregnancy. Br Med J 1985;291:263-6.
2. Scholl TO, Hediger ML, Schall JI, et al. Dietary and serum folate: their influence on the outcome of pregnancy. Am J Clin Nutr 1996;63:520-5.
3. MRC Vitamin Study Research Group. Prevention of neural tube defects: Results of the Medical Research Council Vitamin Study. Lancet 1991;338:131-7.
4. Tamura T, Goldenberg RL, Johnston KE, et al. Serum concentrations of zinc, folate, vitamins A and E, and proteins, and their relationships to pregnancy outcome. Acta Obstet Gynecol Scand Suppl 1997;165:63-70.
5. Tamura T, Goldenberg RL, Freeberg LE, et al. Maternal serum folate and zinc concentrations and their relationships to pregnancy outcome. Am J Clin Nutr 1992;56:365-70.
6. Goldenberg RL, Tamura T, Cliver SP, et al. Serum folate and fetal growth retardation: a matter of compliance? Obstet Gynecol 1992;795 (Pt 1):719-22.
7. Neggers YH, Goldenberg RL, Tamura T, et al. The relationship between maternal dietary intake and infant birthweight. Acta Obstet Gynecol Scand Suppl 1997;165:71-5.
8. Frelut ML, de Courcy GP, Christides JP, et al. Relationship between maternal folate status and foetal hypotrophy in a population with a good socio-economical level. Int J Vitam Nutr Res 1995;65:267-71.
9. Ek J. Plasma and red cell folate in mothers and infants in normal pregnancies. Relation to birth weight. Acta Obstet Gynecol Scand 1982;61:17-20.
10. Malinow MR, Rajkovic A, Duell PB, et al. The relationship between maternal and neonatal umbilical cord plasma homocyst(e)ine suggests a potential role for maternal homocyst(e)ine in fetal metabolism. Am J Obstet Gynecol 1998;178:228-33.
11. Burke G, Robinson K, Refsum H, et al. Intrauterine growth retardation, perinatal death, and maternal homocysteine levels. N Engl J Med 1992;326:69-70 [letter].
12. Iyengar L, Rajalakshmi K. Effect of folic acid supplement on birth weights of infants. Am J Obstet Gynecol 1975;122:332-6.
13. Rolschau J, Date J, Kristoffersen K. Folic acid supplement and intrauterine growth. Acta Obstet Gynecol Scand 1979;58:343-6.
14. Blot I, Papiernik E, Kaltwasser JP, et al. Influence of routine administration of folic acid and iron during pregnancy. Gynecol Obstet Invest 1981;12:294-304.
15. Baumslag N, Edelstein T, Metz J. Reduction of incidence of prematurity by folic acid supplementation in pregnancy. Br Med J 1970;1:16-7.
16. Fleming AF, Martin JD, Hahnel R, Westlake AJ. Effects of iron and folic acid antenatal supplements on maternal haematology and fetal wellbeing. Med J Aust 1974;2:429-36.
17. Fletcher J, Gurr A, Fellingham FR, et al. The value of folic acid supplements in pregnancy. J Obstet Gynaecol Br Commonw 1971;78:781-5.
18. Giles PF, Harcourt AG, Whiteside MG. The effect of prescribing folic acid during pregnancy on birth-weight and duration of pregnancy. A double-blind trial. Med J Aust 1971;2:17-21.
19. Sutterlin M, Bussen S, Ruppert D, Steck T. Serum levels of folate and cobalamin in women with recurrent spontaneous abortion. Hum Reprod 1997;12:2292-6.
20. Wouters MG, Boers GH, Blom HJ, et al. Hyperhomocysteinemia: a risk factor in women with unexplained recurrent early pregnancy loss. Fertil Steril 1993;60:820-5.
21. Steegers-Theunissen RP, Boers GH, Blom HJ, et al. Hyperhomocysteinaemia and recurrent spontaneous abortion or abruptio placentae. Lancet 1992;339:1122-3 [letter].
22. Quere I, Bellet H, Hoffet M, et al. A woman with five consecutive fetal deaths: case report and retrospective analysis of hyperhomocysteinemia prevalence in 100 consecutive women with recurrent miscarriages. Fertil Steril 1998;69:152-4.
23. Quere I, Mercier E, Bellet H, et al. Vitamin supplementation and pregnancy outcome in women with recurrent early pregnancy loss and hyperhomocysteinemia. Fertil Steril 2001;75:823-5.
24. Pietrzik K, Prinz R, Reusch K, et al. Folate status and pregnancy outcome. Ann N Y Acad Sci 1992;669:371-3.
25. Neiger R, Wise C, Contag SA, et al. First trimester bleeding and pregnancy outcome in gravidas with normal and low folate levels. Am J Perinatol 1993;10:460-2.
26. Neela J, Raman L. The relationship between maternal nutritional status and spontaneous abortion. Natl Med J India 1997;10:15-6.
27. Botto LD, Mulinare J, Erickson JD. Occurrence of congenital heart defects in relation to maternal mulitivitamin use. Am J Epidemiol 2000;151:878-84.
28. Czeizel AE. Reduction of urinary tract and cardiovascular defects by periconceptional multivitamin supplementation. Am J Med Genet 1996;62:179-83.
29. Tamura T, Goldenberg RL, Freeberg LE, et al. Maternal serum folate and zinc concentrations and their relationships to pregnancy outcome. Am J Clin Nutr 1992;56:365-70.