I.B. CHIRKOVA1, Kh.T. ABDULKERIMOV1, K.I. KARTASHOVA1, A.V. KOLESNIKOVA1, I.M. TUSHNOLOBOV2 1Ural State Medical University of the Ministry of Health of the Russian Federation, 3 Repin St., Ekaterinburg, Russian Federation, 620028 2Children City Clinical Hospital № 9, 51 Reshetskaya St., Ekaterinburg, Russian Federation, 620134 Chirkova I.B. — postgraduate student of the Department of Otorhinolaryngology, tel. +7-908-635-41-33, […]