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/32328827/
Full Text at the institutional repository	free resource	Andalusian Health Repository	http://hdl.handle.net/10668/15426
	subscription/membership/fee required	Springer	https://doi.org/10.1007/s00464-020-07555-y
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/32328827
Full text from	free resource	White Rose Research Online	https://eprints.whiterose.ac.uk/160297/