M.YU. ULUPOV, M.A. RYABOV, M.E. MALKOVA The first St. Petersburg State Medical University named after academician I.P. Pavlov, 6-8 Lva Tolstogo St., St. Petersburg, Russian Federation, 197022 Ryabova M.A. ― Doc. Med. Sc., Professor of the Department of Otorhinolaryngology with the clinic, e-mail: [email protected] Ulupov M.Yu. ― Cand. Med. Sc., Associate Professor of the Department […]