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/30197423/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/30197423
	free resource	Pacini Editore	https://doi.org/10.14639/0392-100X-1067