Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0376-8716(21)00198-8
Opioids and Opioid Use Disorder (OUD)	free resource	MedlinePlus Health Information	https://medlineplus.gov/opioidsandopioidusedisorderoud.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/33964730/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/33964730
	free resource	scite Smart Citations	https://scite.ai/reports/33964730