About: http://webisa.webdatacommons.org/114993067

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	By mid-century, medical care became more significant and other factors less so.
http://www.w3.org/ns/prov#wasQuotedFrom	nber.org