Name	Info	Provider	Link
	free resource	Medknow Publications and Media Pvt Ltd	http://www.clinicalimagingscience.org/article.asp?issn=2156-7514;year=2012;volume=2;issue=1;spage=78;epage=78;aulast=Sarkar
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23393634/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/23393634