About: http://webisa.webdatacommons.org/320952002

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, this study is an observational study, so we cannot rule out the presence of unmeasured confounding.
http://www.w3.org/ns/prov#wasQuotedFrom	pubmedcentralcanada.ca