About: http://webisa.webdatacommons.org/5333588

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	So you go and find the paper, and what you find is an observational study.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com