Name	Info	Provider	Link
	subscription/membership/fee required	Ingenta plc	https://www.ingentaconnect.com/openurl?genre=article&issn=0003-4932&volume=267&issue=4&spage=700&aulast=Avery
Esophageal Cancer	free resource	MedlinePlus Health Information	https://medlineplus.gov/esophagealcancer.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=28288055.ui
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/28288055/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/28288055
	free resource	scite Smart Citations	https://scite.ai/reports/28288055
	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1097/SLA.0000000000002204