E. L. Savlevich
Central State Medical Academy of Department for Presidential Affairs of the Russian Federation; Moscow Regional Research Clinical Institute named after M.F. Vladimirsky
Russian Federation

Elena L. Savlevich - Dr. Sci. (Med.), Associate Professor of the Department of Otorhinolaryngology, Central State Medical Academy of Department for Presidential Affairs of the Russian Federation; Department Senior Researcher Otorhinolaryngology, Moscow Regional Research Clinical Institute named after M.F. Vladimirsky.

19, Bldg. 1а, Marshal Timoshenko St., Moscow, 15000; 61/2, Bldg. 1, Schepkin St., Moscow, 129110

P. V. Markus
Polyclinic No. 3 of Department for Presidential Affairs of the Russian Federation
Russian Federation

Petr V. Markus - Head of the Department of Otorhinolaryngology with the Office of Audiology and Hearing Aids, Polyclinic No. 3 of Department for Presidential Affairs of the Russian Federation.

31, Groholsky Lane, Moscow, 129090

N. E. Doroshchenko
United Hospital and Polyclinic, Department for Presidential Affairs of the Russian Federation
Russian Federation

Natalia E. Doroshchenko - Cand. Sci. (Med.), Head of the Department of Otorhinolaryngology, United Hospital and Polyclinic, Department for Presidential Affairs of the Russian Federation.

6, Michurinskiy Ave, Moscow, 119330

N. A. Batskalevich
City Clinical Hospital No. 40
Russian Federation

Nataliia A. Batskalevich - Cand. Sci. (Med.), Deputy Chief Physician of the Infectious Disease Service, City Clinical Hospital No. 40.

189, Volgogradskaya St., Yekaterinburg, 620102