About: http://webisa.webdatacommons.org/40757911

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	Until then there was a struggle between those who believed that cancer was caused by environmental exposures to carcinogens and those who believed that the cause was a viral infection.
http://www.w3.org/ns/prov#wasQuotedFrom	nap.edu