V. P. Novikova
Saint Petersburg State Paediatric Medical University
Russian Federation

Valeriya P. Novikova, MD, PhD, DSc, professor, head of the department of introduction to paediatric diseases with the course of baby care, head of the laboratory of medico- social problems in paediatrics

2 Litovskaya str., Saint Petersburg, 194100

A. I. Khavkin
Research and Clinical Institute of Pediatrics at the N. I. Pirogov Russian National Research Medical University
Russian Federation

Anatoly I. Khavkin, MD, PhD, DSci, professor, senior researcher of the department of gastroenterology, Academician Yu. E. Veltishchev

2 Litovskaya str., Saint Petersburg, 194100

N. E. Prokopyeva
Saint Petersburg State Paediatric Medical University
Russian Federation

Natalia E. Prokopyeva, laboratory assistant- researcher of the laboratory of medico- social problems in paediatrics

2 Taldomskaya str., Moscow, 125412