M.A. RYABOVA, O.M. KOLESNIKOVA The First St. Petersburg State Medical University named after acad. I.P. Pavlov, 6-8 Lev Tolstoy St., St. Petersburg, Russian Federation, 197022 Ryabova M.A. — D. Med. Sc., Professor of the Department of Otorhinolaryngology, tel. (812) 499-70-19, e-mail: marinaryabova@mail.ru Kolesnikova O.M. — Cand. Med. Sc., otolaryngologist of the First St. Petersburg State […]