V. V. Dvoryanchikov
Saint Petersburg Research Institute of Ear, Throat, Nose and Speech
Russian Federation

Vladimir V. Dvoryanchikov, Dr. Sci. (Med.), Professor, Honoured Doctor of the Russian Federation, Director 

9, Bronnitskaya St., St Petersburg, 190013

G. S. Maltseva
Saint Petersburg Research Institute of Ear, Throat, Nose and Speech
Russian Federation

Galina S. Maltseva, Dr. Sci. (Med.), Academic Secretary

9, Bronnitskaya St., St Petersburg, 190013

S. S. Pavlova
Saint Petersburg Research Institute of Ear, Throat, Nose and Speech
Russian Federation

Svetlana S. Pavlova, Junior Researcher of the Organizational and Methodical Department

9, Bronnitskaya St., St Petersburg, 190013

V. V. Turieva
Saint Petersburg Research Institute of Ear, Throat, Nose and Speech
Russian Federation

Victoria V. Turieva, Junior Researcher of the Organizational and Methodical Department

9, Bronnitskaya St., St Petersburg, 190013