6Sobotka JM, Rahwan RG. Teratogenesis induced by short - and long - term exposure of Xenopus laevis progeny to lead [ J ]. Toxicol Environ Health, 1995,44:469 - 484.
7Irgens A, Kruger K, Skorve AH. Reproductive outcome in offspring of parents occupationally exposed to lead in Norway[ J]. Am J Ind Med, 1998, 34:431 -437.
8Cengiz B, et al. Serum zinc, selenium, copper, and lead levels in women with second - trimester induced abortions resulting from neural tube defects[ J]. Biol Trace Elem Res,2004, 97:225 -235.
9Bound JP, Harvey PW, Francis B J, et al. Involvement of deprivation and environmental lead in neural tube defects : a matched case - control study[ J ]. Arch Dis Child, 1997,76 : 107 - 112.
10Carrillo- Ponce MdeL, Martinezerdaz VA, Velasco- Rodriguez VM, et al. Serum lead , cadium , and zinc levels in newborns with neural tube defects from a polluted zone in Mexico [ J ]. Reprod Toxicol, 2004,19(2) :149 - 154.
