A. A. Krivopalov
Saint Petersburg Research Institute of Ear, Throat, Nose and Speech; North-Western State Medical University named after I.I. Mechnikov
Russian Federation

Aleksandr А. Krivopalov, Dr. Sci. (Med.), Head of the Research Department of Upper Respiratory Pathology, Saint Petersburg Research Institute of Ear, Throat, Nose and Speech; Associate Professor of the Department of ORL Diseases, North-Western State Medical University named after I.I. Mechnikov;

9, Bronnitskaya St., St Petersburg, 190013, Russia;
41, Kirochnaya St., St Petersburg, 191015, Russia

I. G. Arustamyan
Saint Petersburg Research Institute of Ear, Throat, Nose and Speech
Russian Federation

Irina G. Arustamyan, Cand. Sci. (Med.), Research Scientist, Department of Upper Respiratory Pathology

9, Bronnitskaya St., St Petersburg, 190013, Russia

L. S. Krasheninnikova
South Ural State Medical University
Russian Federation

Lilia S. Krasheninnikova, Postgraduate Student, Department of Otorhinolaryngology

64, Vorovskiy St., Chelyabinsk, 454092, Russia