Name	Info	Provider	Link
Endoscopy	free resource	MedlinePlus Health Information	https://medlineplus.gov/endoscopy.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32601639/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/32601639
	free resource	Saudi Medical Journal	https://doi.org/10.15537/smj.2020.7.25137