<http://webisa.webdatacommons.org/203549970>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/203549970>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<ahrq.gov> .
<http://webisa.webdatacommons.org/prov/435109541>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/203549970> .
<http://webisa.webdatacommons.org/203549970>	<http://www.w3.org/ns/prov#value>	"This is a problem, especially given that the major measles epidemic in the United States in 1989 to 1991 was attributed to inadequate vaccination levels." .