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	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=0277-3740&volume=35&issue=12&spage=1656&aulast=Di Zazzo
Corneal Disorders	free resource	MedlinePlus Health Information	https://medlineplus.gov/cornealdisorders.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=27442322.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/27442322/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/27442322
	free resource	scite Smart Citations	https://scite.ai/reports/27442322
	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1097/ICO.0000000000000951