S.A. KARPISHCHENKO, G.V. LAVRENOVA, A.N. BERVINOVA Pavlov First Saint Petersburg State Medical University, 6-8 Leo Tolstoy Str., Saint Petersburg, Russian Federation, 197022  Karpishchenko S.A. — D. Sc. (medicine), Professor of the Otorhinolaryngology Department, e-mail: [email protected] Lavrenova G.V. — D. Sc. (medicine), Professor of the Otorhinolaryngology Department, e-mail: [email protected] Bervinova A.N. — resident doctor of the […]