<http://webisa.webdatacommons.org/prov/36097849>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/130379917> .
<http://webisa.webdatacommons.org/130379917>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<ahrq.gov> .
<http://webisa.webdatacommons.org/130379917>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/130379917>	<http://www.w3.org/ns/prov#value>	"Since these study designs using different types of controls are expected to yield quite different conclusions (effectiveness vs. comparative effectiveness), we separated them in our analyses." .