Sh.M. ISMAGILOV1, R.A. MUKHAMADIEV2 1Kazan State Medical University, 49 Butlerov Str., Kazan, Russian Federation, 420012 2Central Municipal Clinical Hospital №18, 2 Mavlutov Str., Kazan, Russian Federation, 420001 Ismagilov Sh.M. ― Cand. Med. Sc., Associate Professor of the Otorhinolaryngology Department, tel. +7-917-391-18-03, e-mail: ism_sh63@mail.ru Mukhamadiev R.A. ― Head of the Otorhinolaryngology Department, tel. (843) 224-33-91, e-mail: […]