About: http://webisa.webdatacommons.org/394222244

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	In an effort to control for confounding variables, the researchers controlled for the use of alcohol and illicit drugs other than marijuana.
http://www.w3.org/ns/prov#wasQuotedFrom	instituteofmidwifery.org