<prompt> Causes of non-healing of enterocutaneous fistula are all except:Epithelialization of trackRadiation enteritisAcute inflammatory diseaseTrack length 3 cm  <response>: Factors Preventing Spontaneous Fistula Closure High output 500 mLday Severe disruption of intestinal continuity 50 of bowel circumference Active inflammatory bowel disease of bowel segment Cancer Radiation enteritis Distal obstruction Undrained abscess cavity Foreign body in the fistula tract Fistula tract 2.5 cm long Epithelialization of fistula tract 