S.A. KARPISHCHENKO, G.V. LAVRENOVA, E.I. MURATOVA Pavlov First Saint Petersburg State Medical University, 6-8 Leo Tolstoy Str., Saint Petersburg, Russian Federation, 197022  Karpishchenko S.A. ― Doc. Med. Sc., Professor of the Otorhinolaryngology Department, tel. +7-911-717-62-26, e-mail: [email protected] Lavrenova G.V. ― Doc. Med. Sc., Professor of the Otorhinolaryngology Department, tel. +7-921-916-63-82, e-mail: [email protected] Muratova E.I. ― […]