1. Possible prevention of neural tube defects by periconceptional vitamin supplementation;Smithells, R.W.; Sheppard, S.; Schorah, C.J.;Lancet,1980
2. Prevention of neural tube defect recurrences in Yorkshire: final report;Smithells, R.W.; Sheppard, S.; Wild, J.; Schorah, C.J.;Lancet,1989
3. Double-blind randomised controlled trial of folate treatment before conception to prevent recurrence of neural-tube defects;Laurence, K.M.; James, N.; Miller, M.H.; Tennant, G.B.; Campbell, H.;BMJ,1981
4. Prevention of neural tube defects: results of the Medical Research Council Vitamin Study;Group, M.R.C.Vitamin Study Research;Lancet,1991
5. Prevention of the first occurrence of neural-tube defects by periconceptional vitamin supplementation;Czeizel, A.E.; Dudas, I.,1992