A. I. Khavkin
Research Clinical Institute of Childhood
Russian Federation

Anatoly I. Khavkin - Dr. Sci. (Med.), Professor, Head of the Moscow Regional Center of Pediatric Gastroenterology and Hepatology, Chief Researcher of the Department of Pediatrics, Research Clinical Institute of Childhood.

62, Bolshaya Serpukhovskaya St., Moscow, 115093

V. P. Novikova
St Petersburg State Pediatric Medical University
Russian Federation

Valeriya P. Novikova - Dr. Sci. (Med.), Professor, Head of the Department of Propaedeutics of Children's Diseases with a course of general child care, Head of the Laboratory of Medical and Social Problems in Pediatrics of the Research Center, St Petersburg State Pediatric Medical University.

2, Litovskaya St., St Petersburg, 194100

M. M. Gurova
St Petersburg State Pediatric Medical University; Belgorod State University
Russian Federation

Margarita M. Gurova - Dr. Sci. (Med.), Associate Professor, Leading Researcher of the Laboratory of Medical and Social Problems in Pediatrics of the Research Center, St Petersburg State Pediatric Medical University; Professor, Department of Pediatrics with the Course of Children's Surgical Diseases, Belgorod State University.

2, Litovskaya St., St Petersburg, 194100; 85, Pobedy St., Belgorod, 308015