Types Anal fistula






^ colorectal surgery - anal fistula . colorectal.surgery.ucsf.edu. retrieved 2016-07-03. 
^ parks, a. g.; gordon, p. h.; hardcastle, j. d. (1976-01-01). classification of fistula-in-ano . british journal of surgery. 63 (1): 1–12. doi:10.1002/bjs.1800630102. issn 0007-1323. pmid 1267867. 
^ shawki, sherief; wexner, steven d (2011-07-28). idiopathic fistula-in-ano . world journal of gastroenterology. 17 (28): 3277–3285. doi:10.3748/wjg.v17.i28.3277. issn 1007-9327. pmc 3160530 . pmid 21876614. 
^ anorectal sinuses , fistulae . www.meb.uni-bonn.de. retrieved 2016-07-03. 






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