About: http://webisa.webdatacommons.org/254395706

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	Contrast agents, such as barium or iodine, have been used over the years to attenuate or block X-rays so that the contrast between various structures is increased.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com