About: http://webisa.webdatacommons.org/384882880

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	The purpose is to study the extent to which stress and other factors, including money, the amount of drug available and the amount of work effort, affect drug choice.
http://www.w3.org/ns/prov#wasQuotedFrom	clinicaltrials.gov