Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=22717061.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22717061/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/22717061
	subscription/membership/fee required	Cambridge University Press	https://www.cambridge.org/core/product/identifier/S0950268812000581/type/journal_article