Sh.M. ISMAGILOV, M.N. GILYALOV, M.F. ISMAGILOV Kazan State Medical University, 49 Butlerov Str., Kazan, Russian Federation, 420012 Ismagilov Sh.M. ― Cand. Med. Sc., Associate Professor of the Otorhinolaryngology Department, tel. +7-917-391-18-03, e-mail: [email protected] Gilyalov M.N. ― postgraduate student of the Otorhinolaryngology Department, tel. +7-917-221-51-34, e-mail: [email protected] Ismagilov M.F. ― D. Med. Sc., Professor of the […]