About: http://webisa.webdatacommons.org/439676469

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	Confounding by indication is a limitation when performing observational studies of this nature.
http://www.w3.org/ns/prov#wasQuotedFrom	nih.gov