About: http://webisa.webdatacommons.org/169164580

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	First, the meta-analysis was based on data mainly from observational studies because there were only two RCTs.
http://www.w3.org/ns/prov#wasQuotedFrom	plos.org