E. A. Kulebina
National Medical Research Center for Children’s Health
Russian Federation

Elena A. Kulebina, pediatrician, gastroenterologist, Postgraduate Studient of the Department of Gastroenterology with a Hepatology Group 

2, Bldg.1, Lomonosovskiy Prospect, Moscow, 119926

A. N. Surkov
National Medical Research Center for Children’s Health; Pirogov Russian National Research Medical University
Russian Federation

Andrey N. Surkov, Dr. of Sci. (Med.), Head of the Department of Gastroenterology with a Hepatology Group; Associate Professor of the Department of Pediatrics of the Faculty of Pediatrics

2, Bldg.1, Lomonosovskiy Prospect, Moscow, 119926

1, Ostrovityanov St., Moscow, 117997