About: http://webisa.webdatacommons.org/28306101

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	A test that is positive for morphine may be from morphine, codeine, or heroin use because of drug metabolism (morphine is a metabolite of heroin and codeine).
http://www.w3.org/ns/prov#wasQuotedFrom	aafp.org