<http://webisa.webdatacommons.org/325605710>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<virtualtrials.org> .
<http://webisa.webdatacommons.org/325605710>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/30228341>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/325605710> .
<http://webisa.webdatacommons.org/325605710>	<http://www.w3.org/ns/prov#value>	"However, several issues remain to be resolved including patient selection bias and confidentiality." .