Impact of Folic Acid Fortification of the US Food Supply on the Occurrence of Neural Tube Defects
JAMA 285:2981-2986,3022, Honein,M.A.,et al, 2001
Folic Acid and the Prevention of NEural Tube Defects
BMJ 310:1019-1020, Wald,N.J.&Bower,C., 1995
Periconceptional Folic Acid Exposure and Risk of Occurrent Neural Tube Defects
JAMA 269:1257-1261, 12921993., Werler,M.M.,et al, 1993