M. A. Lengina
South Ural State Medical University
Russian Federation

Maria A. Lengina, Cand. Sci. (Med.), Associate Professor, Associate Professor Department of Otorhinolaryngology

64, Vorovskiy St., Chelyabinsk, 454092, Russia 

A. M. Korkmazov
South Ural State Medical University
Russian Federation

Arsen M. Korkmazov, Cand. Sci. (Med.), Associate Professor, Associate Professor Department of Otorhinolaryngology

64, Vorovskiy St., Chelyabinsk, 454092, Russia 

I. I. Sarkisyan
St Petersburg State Pediatric Medical University
Russian Federation

Irina I. Sarkisyan, Cand. Sci. (Med.), Associate Professor of the Department of Plastic and Reconstructive Surgery, Faculty of Postgraduate and Additional Professional Education

2, Litovskaya St., St Petersburg, 194100, Russia 

A. S. Bidzhiev
Pavlov First Saint Petersburg State Medical University
Russian Federation

Ali S. Bidzhiev, Student

6–8, Lev Tolstoy St., St Petersburg, 197022, Russia;  

E. O. Kiseleva
South Ural State Medical University
Russian Federation

Ekaterina O. Kiseleva, Assistant of the Department of Otorhinolaryngology,

64, Vorovskiy St., Chelyabinsk, 454092, Russia