Name	Info	Provider	Link
	free resource	Medknow Publications and Media Pvt Ltd	http://www.aeronline.org/article.asp?issn=0259-1162;year=2018;volume=12;issue=4;spage=774;epage=777;aulast=Gurava
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=30662106.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/30662106/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/30662106