About: http://webisa.webdatacommons.org/116127825

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	to eliminate the history and selection threats to internal validity, and other explanations such as the effect being due to advertising
http://www.w3.org/ns/prov#wasQuotedFrom	slideshare.net