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Opioids and Opioid Use Disorder (OUD)	free resource	MedlinePlus Health Information	https://medlineplus.gov/opioidsandopioidusedisorderoud.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=34666634.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34666634/
	subscription/membership/fee required	Taylor & Francis	https://www.tandfonline.com/doi/full/10.1080/08897077.2021.1975873
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/34666634