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	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=0889-8391&volume=28&issue=3&spage=156&aulast=Ngo
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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25568593/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/25568593
	free resource	scite Smart Citations	https://scite.ai/reports/25568593