Name	Info	Provider	Link
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=17910120.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/17910120/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/17910120
	subscription/membership/fee required	Zhejiang University Press	http://www.jzus.zju.edu.cn/article.php?doi=10.1631/jzus.2007.B0756