S.B. MOSIKHIN1, A.V. BEZBRYAZOV2, E.M. POKROVSKAYA3 ¹Kazan State Medical Academy, 36 Butlerov St., Kazan, Russian Federation, 420012 ²City Clinical Hospital № 12, 7 Lechebnaya St., Kazan, Russian Federation, 420021 3Hospital «Mart», 16 A. Kutuya St., Kazan, Russian Federation, 420073 Mosikhin S.B. — D. Med. Sc., Professor of the Department of Otorhinolaryngology, tel. +7-917-288-01-96, e-mail: serbor_ent8@meil.ru […]