TY JOUR TI Differential diagnosis of organic and functional pathologies of the gastrointestinal tract by using a non-invasive marker of activity KW ulcerative colitis KW calprotectin KW inflammatory bowel disease. JO Journal of New Medical Technologies. eJournal AU Nikitin, A.. AU Matyukhin, A.. PY 2015 IS 9 PB INFRA-M Academic Publishing LLC.