Name	Info	Provider	Link
Heroin	free resource	MedlinePlus Health Information	https://medlineplus.gov/heroin.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=15598191.ui
	subscription/membership/fee required	Wiley	https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0965-2140&date=2005&volume=100&issue=1&spage=46
Full text from	free resource	White Rose Research Online	https://eprints.whiterose.ac.uk/596/