O. Yu. Chizhova
North-Western State Medical University named after I.I. Mechnikov
Russian Federation

Olga Yu. Chizhova – MD, PhD, Professor, Chair of Propedeutics of Internal Diseases, Gastroenterology and Dietology

Piskarevskij prosp. 47, Saint-Petersburg, 195067

L. N. Belousova
North-Western State Medical University named after I.I. Mechnikov
Russian Federation

Liya N. Belousova – MD, PhD, Associate Professor, Chair of Propedeutics of Internal Diseases, Gastroenterology and Dietology,

Piskarevskij prosp. 47, Saint-Petersburg, 195067

I. G. Bakulin
North-Western State Medical University named after I.I. Mechnikov
Russian Federation

Igor G. Bakulin – MD, PhD, Professor, Head of Chair of Propedeutics of Internal Diseases, Gastroenterology and Dietology 

Piskarevskij prosp. 47, Saint-Petersburg, 195067