Table 1.

 Clinical data on patients in the control group

No	Sex	Age at surgery (y)	Fistula location	Clinical diagnosis
1	M	49	Skin, cervical	Recurring cervical fistulae after squamous cell carcinoma of the tongue
2	M	40	Perianal	Recurring perianal fistulae, exclusion of CD
3	F	79	Skin, abdominal	Fistula of the skin, abdominal
4	M	34	Perianal	Sinus peronidalis with recurring perianal fistulae
5	F	51	Stomach	Fistula of the stomach after ulcus ventriculi
6	M	63	Oral cavity	Dental abscess with recurring fistulae of the oral cavity
7	F	42	Perianal	Fistula after periproctitic abscess, since 1994 until 2003 no CD, 2003 breast cancer
		42	Perianal
8	M	47	Skin, thoracal	Fistula after thoracal abscess
		47	Skin, thoracal
9	F	73	Vaginal	Vaginal fistula after radiation of vaginal squamous cell carcinoma
10	M	41	Perianal	Sinus pilonidalis with recurring perianal fistulae
11	F	21	Perianal	Sinus pilonidalis with perianal fistula