About: http://webisa.webdatacommons.org/39894564

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	However, the design limitations proved difficult to overcome, especially in the face of unexpectedly large, favorable risk factor changes in control sites.
http://www.w3.org/ns/prov#wasQuotedFrom	stanford.edu