1. Department of Otorhinolaryngology, I.I Mechnikov North-Western State Medical University, St. Petersburg, Russia;
2. K.A. Rauhfus Children’s City Multidisciplinary Clinical Center for High Medical Technologies, St. Petersburg, Russia;
3. Saint-Petersburg Research Institute of Ear, Throat, Nose and Speech, St. Petersburg, Russia;
4. First Pavlov State Medical University of Saint Petersburg, St. Petersburg, Russia