M. A. Shakhova
Privolzhsky Research Medical University
Russian Federation

Mariia A. Shakhova, Cand. Sci. (Med.), Associate Professor, 

10/1, Minin and Pozharsky Square, Nizhny Novgorod, 603950, Russia

V. A. Fokeev
Privolzhsky Research Medical Universityж Nizhny Novgorod Regional Clinical Hospital named after N.A. Semashko
Russian Federation

Vyacheslav A. Fokeev, Postgraduate Student of the Department of Ear, Nose and Throat Diseases, Privolzhsky Research Medical University; Otorhinolaryngologist, Nizhny Novgorod Regional Clinical Hospital named after N.A. Semashko

110/1, Minin and Pozharsky Square, Nizhny Novgorod, 603950, Russia; 
90, Rodionova St., Nizhny Novgorod, 603905, Russia

V. M. Svistushkin
Sechenov First Moscow State Medical University (Sechenov University)
Russian Federation

Valery M. Svistushkin, Dr. Sci. (Med.), Professor, Head of the Department of Ear, Nose and Throat Diseases, Institute of Clinical Medicine

8, Bldg. 2, Trubetskaya St., Moscow, 119991, Russia

A. V. Shakhov
Privolzhsky Research Medical University
Russian Federation

Andrei V. Shakhov, Dr. Sci. (Med.), Head of the Department of Ear, Nose and Throat Diseases

10/1, Minin and Pozharsky Square, Nizhny Novgorod, 603950, Russia