M.A. RYABOVA, O.M. KOLESNIKOVA, E.E. POSOBILO, P.D. POTAPOVA Saint Petersburg First State Medical University named after Acad. I.P. Pavlov, 6-8 Tolstoy Str., Saint Petersburg, Russian Federation, 197022  Ryabova M.A. ― D. Med. Sc., Professor of the Department of Otorhinolaryngology, tel. +7-921-341-14-12, e-mail: [email protected] Kolesnikova O.M. ― Cand. Med. Sc., Associate Professor of the Department of […]