About: http://webisa.webdatacommons.org/285039201

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	My feeling for that time part is that registration became lax after measles was under control and getting reliable data from the underlying documentation is a laborious task.
http://www.w3.org/ns/prov#wasQuotedFrom	r-bloggers.com