Spina bifida and vitamins.

K M Laurence, N James, M H Miller, G B Tennant, H Campbell, Double-blind randomised controlled trial of folate treatment before conception to prevent recurrence of neural-tube defects. BMJ. ,vol. 282, pp. 1509- 1511 ,(1981) , 10.1136/BMJ.282.6275.1509

D. H. M. Woollam, J. W. Millen, Effect of Cortisone on the Incidence of Cleft-palate Induced by Experimental Hypervitaminosis-A BMJ. ,vol. 2, pp. 197- 198 ,(1957) , 10.1136/BMJ.2.5038.197

J P Bound, P W Harvey, D M Brookes, B M Sayers, The incidence of anencephalus in the Fylde peninsula 1956-76 and changes in water hardness. Journal of Epidemiology & Community Health. ,vol. 35, pp. 102- 105 ,(1981) , 10.1136/JECH.35.2.102

R W Smithells, S Sheppard, C J Schorah, M J Seller, N C Nevin, R Harris, A P Read, D W Fielding, Apparent prevention of neural tube defects by periconceptional vitamin supplementation. Archives of Disease in Childhood. ,vol. 56, pp. 911- 918 ,(1981) , 10.1136/ADC.56.12.911