Name	Info	Provider	Link
Fistulas	free resource	MedlinePlus Health Information	https://medlineplus.gov/fistulas.html
	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/17616026/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/17616026
	free resource	M2PI	http://kjim.org/journal/view.html?year=2007&volume=22&number=2&spage=106