Name	Info	Provider	Link
	subscription/membership/fee required	Chinese Medical Association Publishing House Ltd.	https://www.yiigle.com/LinkIn.do?linkin_type=pubmed&issn=0529-5815&year=2012&vol=50&issue=11&fpage=971
Fistulas	free resource	MedlinePlus Health Information	https://medlineplus.gov/fistulas.html