2BRUENING K.Dietary calcium intakes of urban children at risk of lead poisoning[J].Environ Health Perspect,1999,107:431-435.
3BOGDEN JD,OLESKE JM,LOURIA DB.Lead poisoningone approach to a problem that will not go away[J].Environ Health Perspect,1997,105:1284-1287.
4Centers for disease Control Preventing Lead Poisoning in your children: a steatenent by centers for diseases control , Atlant: GA: CDC, 1990:1-9
5Committee on Measuring Lead in Critical Populations. Measuring lead exposure ininants, children and other sensitive population. Washington DC: National Academy Press, 1993:1 -72