<http://webisa.webdatacommons.org/prov/308723568>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/103819413> .
<http://webisa.webdatacommons.org/103819413>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/103819413>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.ca> .
<http://webisa.webdatacommons.org/103819413>	<http://www.w3.org/ns/prov#value>	"In some known surgical procedures, bone and other tissue that has impinged upon the spinal canal and/or exerted pressure on the spinal cord can be removed." .