I. S. Dolgopolov
Tver State Medical University
Russian Federation

Dr. Sci. (Med.), head of the department of pediatrics, pediatric faculty, head of the pediatric medical center,

12/1 Vorontsovo Pole str., Moscow 105064

M. Yu. Rykov
Tver State Medical University; N. A. Semashko National Research Institute of Public Health
Russian Federation

Dr. Sci. (Med.), associate professor, head of the department of Oncology of the Faculty of Additional Professional Education, Advisor to the Rector for Scientific Work, 12/1 Vorontsovo Pole str., Moscow 105064;

researcher, Moscow