About: http://webisa.webdatacommons.org/272227451

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	These particularly include historical controlled trials and case-control studies but other forms of observational data can also reveal important issues.
http://www.w3.org/ns/prov#wasQuotedFrom	politics.co.uk