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	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=0008-4212&volume=92&issue=1&spage=1&aulast=Khan
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24383867/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/24383867
	free resource	scite Smart Citations	https://scite.ai/reports/24383867