A. V. Nikitin
Pirogov Russian National Research Medical University; Morozov Children’s Clinical Hospital, Moscow Department of Health
Russian Federation

Artem V. Nikitin, MD, PhD, assistant of department of gastroenterology; doctor department of gastroenterology

125412, Moscow, st. Taldomskaya, Building 2

119049 Moscow, 4th Dobryninsky Lane 1/9, Building 17 

A. I. Khavkin
Pirogov Russian National Research Medical University
Russian Federation

Anatoly I. Khavkin, MD, PhD, Dr Sci, professor, Veltischev Research and Clinical Institute for Pediatrics, Senior Researcher, Department of Gastroenterology

125412, Moscow, st. Taldomskaya, Building 2 

T. A. Skvortsova
Pirogov Russian National Research Medical University
Russian Federation

Tamara A. Skvortsova, MD, Head of the Department of Gastroenterology; chief freelance children's specialist-gastroenterologist HCM; Associate Professor, Department of Gastroenterology

125412, Moscow, st. Taldomskaya, Building 2 

G. V. Volynets
Pirogov Russian National Research Medical University
Russian Federation

Galina V. Volynets, MD, PhD, Dr Sci, Veltischev Research and Clinical Institute for Pediatrics, Head of the Department of Gastroenterology

125412, Moscow, st. Taldomskaya, Building 2 

A. O. Atameeva
Morozov Children’s Clinical Hospital, Moscow Department of Health
Russian Federation

Anastasiya O. Atameeva, Intern
119049 Moscow, 4th Dobryninsky Lane 1/9, Building 17