1) V.A. Almazov National Medical Research Center, Saint Petersburg, Russia;
2) Saint Petersburg State Pediatric Medical University, Saint Petersburg, Russia
Corresponding author: Yulia A. Fominykh, Dr. Sci. (Med.), Professor, Head of the Department of Propaedeutics of Internal Diseases with Clinic, V.A. Almazov National Medical Research Center, Saint Petersburg, Russia;
jaf@mail.ru