| http://www.w3.org/ns/prov#value | - munities will vary depending on a number of socio-demographic factors including age, gender, race, income level, and environment (CDC, 1991a).The National Health and Nutrition Examination Survey (NHANES) for 1976 - 1991 provides baseline PbB data for the U.S. population (ATSDR, 1999a).
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