Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S1590-8658(08)00045-5
Endoscopy	free resource	MedlinePlus Health Information	https://medlineplus.gov/endoscopy.html
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy/pii?v=S1590-8658(08)00045-5