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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23981853/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/23981853
	subscription/membership/fee required	Wiley	https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=1743-6095&date=2013&volume=10&issue=12&spage=3151
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	subscription/membership/fee required	Silverchair Information Systems	https://academic.oup.com/jsm/article-lookup/doi/10.1111/jsm.12299