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

Sergei V. Ryazantsev, Dr. Sci. (Med.), Professor, Deputy Director for Scientific and Coordination Work with the Regions

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, Research Associate

9, Bronnitskaya St., St Petersburg, 190013

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

Elena V. Tyrnova, Senior Researcher of the Organizational and Methodical Department

9, Bronnitskaya St., St Petersburg, 190013