1. Increased risk of recurrence of pregnancies complicated by fetal neural tube defects in mothers receiving poor diets, and possible benefit of dietary counselling;Laurence;Br Med J,1980
2. Double-blind randomised controlled trial of folate treatment before conception to prevent recurrence of neural tube defects;Laurence;Br Med J,1981
3. Possible prevention of neural tube defects by periconceptional vitamin supplementation;Smithells;Lancet,1980
4. Apparent prevention of neural tube defects by periconceptional vitamin supplementation;Smithells;Arch Dis Childh,1981
5. Co Carter, Ja Fraser Roberts, K. Evans, et al., A three generation family study of cleft lip with or without cleft palate, J Med Genet ((in press)).