Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=29604064.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/29604064/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/29604064
	free resource	Wiley	https://doi.org/10.1113/JP275659
	free resource	scite Smart Citations	https://scite.ai/reports/29604064
	free resource	Spiral, Imperial College Digital Repository	http://hdl.handle.net/10044/1/58682