<http://webisa.webdatacommons.org/prov/47793098>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/212812807> .
<http://webisa.webdatacommons.org/212812807>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com.au> .
<http://webisa.webdatacommons.org/212812807>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/212812807>	<http://www.w3.org/ns/prov#value>	"Artificial mechanical valves tend to calcify more easily and initiate immune system responses as a result of their composition: metals, polymers or other synthetic materials." .