00586naa#a2200181#i#450# EN\INFRA-M\bibl\5539 20240601193309.6 2075-4094 20150706b2015####ek#y0engy0150####ca RUS RU Differential diagnosis of organic and functional pathologies of the gastrointestinal tract by using a non-invasive marker of activity Journal article Moscow INFRA-M Academic Publishing LLC. 2015 0 с. Journal article local Nikitin A. Matyukhin A. naukaru.ru