<http://webisa.webdatacommons.org/prov/504380829>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/320609509> .
<http://webisa.webdatacommons.org/320609509>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<science.gov> .
<http://webisa.webdatacommons.org/320609509>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/320609509>	<http://www.w3.org/ns/prov#value>	"Background There is a need to evaluate complex interaction effects on human health, such as those induced by mixtures of environmental contaminants." .