Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=25677713.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25677713/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/25677713
	free resource	Cambridge University Press	http://journals.cambridge.org/abstract_S000711451400419X