About: http://webisa.webdatacommons.org/41901526

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	such factors as population size, study location (U.S. or non-U.S.), publication year
http://www.w3.org/ns/prov#wasQuotedFrom	biomedcentral.com