S.A. KARPISHCHENKO, O.E. VERESHCHAGINA, E.V. OSIPENKO First Saint Petersburg State Medical University named after Academician I.P. Pavlov, 6-8 Lev Tolstoy Str., Saint Petersburg, Russian Federation, 197022 Karpishchenko S.A. — DM, Professor, Head of the Otolaryngology Department with clinics, tel. (843) 499-70-19, e-mail: karpischenkos@mail.ru Vereshchagina O.E. — PhD (Medicine), doctor-otolaryngologist of Otolaryngology Clinic, tel. (812) 499-70-19, […]