Name	Info	Provider	Link
	free resource	Medknow Publications and Media Pvt Ltd	http://www.jisponline.com/article.asp?issn=0972-124X;year=2009;volume=13;issue=3;spage=126;epage=132;aulast=Singh
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=20379409.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20379409/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/20379409