A.A. NOVOZHILOV1, A.V. SHAKHOV1,2, M.N. VELICHKO1, T.E. ABUBAKIROV1, T.Ph. GAYAZOV1 1Volga District Medical Centre of the Federal Medical and Biological Agency (FMBA), 2 Nizhne-Volzhskaya naberezhnaya St., Nizhny Novgorod, Russian Federation, 603001 2Nizhny Novgorod State Medical Academy, 10/1 Minin and Pozharskiy St., Nizhny Novgorod, Russian Federation, 603950  Novozhilov A.A. — head of ENT-department, tel. +7-950-368-18-20, e-mail: […]