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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19093934/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/19093934
	subscription/membership/fee required	Wiley	https://doi.org/10.1111/j.1532-5415.2008.02015.x
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