S.A. KARPISHCHENKO, O.M. KOLESNIKOVA, Yu.V. LEGKOVA 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, e-mail: karpischenkos@mail.ru Kolesnikova O.M. ― Cand. Med. Sc., Associate Professor of the Otorhinolaryngology Department, e-mail: olga_lozo@mail.ru Legkova Yu.V. ― clinical resident of […]