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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19330386/
	subscription/membership/fee required	Springer	https://dx.doi.org/10.1007/s11552-009-9188-5
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/19330386