P. A. Shamkina
St Petersburg Research Institute of Ear, Throat, Nose and Speech
Russian Federation

Polina A. Shamkina - Postgraduate Student, St Petersburg Research Institute of Ear, Throat, Nose and Speech.

9, Bronnitskaya St., St Petersburg, 190013.

A. A. Krivopalov
St Petersburg Research Institute of Ear, Throat, Nose and Speech
Russian Federation

Aleksandr A. Krivopalov - Dr. Sci. (Med.), Senior Researcher, St Petersburg Research Institute of Ear, Throat, Nose and Speech.

9, Bronnitskaya St., St Petersburg, 190013.

P. I. Panchenko
St Petersburg Research Institute of Ear, Throat, Nose and Speech
Russian Federation

Pavel I. Panchenko - Otorhinolaryngologist, St Petersburg Research Institute of Ear, Throat, Nose and Speech.

9, Bronnitskaya St., St Petersburg, 190013.

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

Sergey V. Ryazantsev - Dr. Sci. (Med.), Professor, Honored Doctor of the Russian Federation, Deputy Director for Scientific and Coordination Work, St Petersburg Research Institute of Ear, Throat, Nose and Speech.

9, Bronnitskaya St., St Petersburg, 190013.