Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0376-8716(10)00328-5
Heroin	free resource	MedlinePlus Health Information	https://medlineplus.gov/heroin.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21075561/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21075561
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy/pii?v=S0376-8716(10)00328-5