E. A. Semenova
I. I. Mechnikov Northwestern State Medical University
Russian Federation

Elena A. Semenova, Cand. of Sci. (Med.), Associate Professor of the Department of Propedeutics of Internal Diseases, Gastroenterology and Dietology named after S. M. Ryss,

47 Piskarevsky ave., Saint Petersburg, 195067

A. Yu. Efremova
I. I. Mechnikov Northwestern State Medical University
Russian Federation

Anastasia Yu. Efremova, 2nd year PhD student of the Department of Propedeutics of Internal Diseases, Gastroenterology and Dietology named after S. M. Ryss,

47 Piskarevsky ave., Saint Petersburg, 195067

I. G. Bakulin
I. I. Mechnikov Northwestern State Medical University
Russian Federation

Igor G. Bakulin, Dr. of Sci. (Med.), Professor, Chief Non-staff Specialist in Internal Medicine of the Ministry of Health of the Russian Federation for the North-Western Federal District, Chief Non-staff Gastroenterologist of the Leningrad Region, Director of the Institute of Therapy, Head of the Department of Propedeutics of Internal Diseases, Gastroenterology and Dietology named after S. M. Ryss, 

47 Piskarevsky ave., Saint Petersburg, 195067

A. P. Annenkova
I. I. Mechnikov Northwestern State Medical University
Russian Federation

Aleksandra P. Annenkova, 2nd year Resident of the Department of Propedeutics of Internal Diseases, Gastroenterology and Dietology named after S. M. Ryss, 

47 Piskarevsky ave., Saint Petersburg, 195067