Yu. S. Preobrazhenskaya
Saint-Petersburg Research Institute of Ear, Throat, Nose and Speech
Russian Federation

Yuliya S. Preobrazhenskaya, Cand. of Sci. (Med.), Researcher, Department of Diagnosis and Treatment of Hearing Loss

 9 Bronnitskaya St., Saint Petersburg, 190013

M. V. Drozdova
Saint-Petersburg Research Institute of Ear, Throat, Nose and Speech
Russian Federation

Marina V. Drozdova, Dr. of Sci. (Med.), Head of Reconstructive Surgery Department

 9 Bronnitskaya St., Saint Petersburg, 190013

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

Sergey V. Ryazantsev, Dr. of Sci. (Med.), Professor, Deputy Director for Research Coordination Relationships with Regional Authorities

 9 Bronnitskaya St., Saint Petersburg, 190013