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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/17478519/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/17478519
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	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/nar/article-lookup/doi/10.1093/nar/gkm211