Name	Info	Provider	Link
	free resource	Medknow Publications and Media Pvt Ltd	http://www.urologyannals.com/article.asp?issn=0974-7796;year=2011;volume=3;issue=2;spage=66;epage=70;aulast=AlTaweel
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=21747594.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21747594/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21747594