Name	Info	Provider	Link
	free resource	BioMed Central	https://www.biomedcentral.com/1471-2369/23/109
Fistulas	free resource	MedlinePlus Health Information	https://medlineplus.gov/fistulas.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/35300609/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/35300609