<http://webisa.webdatacommons.org/351793795>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/13521356>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/351793795> .
<http://webisa.webdatacommons.org/351793795>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<pubmedcentralcanada.ca> .
<http://webisa.webdatacommons.org/351793795>	<http://www.w3.org/ns/prov#value>	"Before childhood vaccination was introduced in the 1940s, pertussis was a major cause of infant death worldwide." .