Natalia Baryshnikova, The Senior Lecturer (Associate Professor) of the Internal Diseases Stomatologic Faculty Department, GBOU VPO «First Saint-Petersburg State medical university n.a. I.P. Pavlova» Ministry of Public Health and Social Affairs of Russian Federation; Gastroenterologist of city centre of colon diseases and gastrointestinal tract microbiota , Saint-Petersburg State Budget Institution of Healthcare City St. Elizabeth Hospital.