Name	Info	Provider	Link
	subscription/membership/fee required	HighWire	https://tobaccocontrol.bmj.com/lookup/pmidlookup?view=long&pmid=34511408
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=34511408.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34511408/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/34511408