Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=31541525.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31541525/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/31541525
	free resource	Wiley	https://onlinelibrary.wiley.com/doi/10.1002/1348-9585.12086
	free resource	Silverchair Information Systems	https://academic.oup.com/joh/article-lookup/doi/10.1002/1348-9585.12086