About: http://webisa.webdatacommons.org/131295115

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	And like virtually every social marketing mechanism the medical establishment employed at the time, these billboards were a form of one-way communication: doctor speaking to patient.
http://www.w3.org/ns/prov#wasQuotedFrom	nationalpost.com