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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19299774/
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See the articles recommended by the Faculty of more than 8,000 leading experts in Biology and Medicine.	subscription/membership/fee required	H1 Connect	https://facultyopinions.com/pubmed/19299774
	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1213/ane.0b013e318199dcd2