Steegers-Theunissen RPM, Boers GH, Trijbels FJM et al. Maternal hyperhomocysteinemia : A risk factor for neural-tube defects? Metabolism 1994 ; 43 : 1475-80.
Kondo A, Fukuda H, Matsuo T et al. C677T mutation in methylenetetrahydrofolate reductase gene and neural tube defects : Should Japanese women undergo gene screening before pregnancy? Gongenit Anom (Kyoto) 2014 ; 54 : 30-4