1. L.I. Sverzhevskiy Scientific Research Institute of Clinical Otorhinolaryngology; N.I. Pirogov Russian National Research Medical University
2. L.I. Sverzhevskiy Scientific Research Institute of Clinical Otorhinolaryngology; City Clinical Hospital named after V.V. Veresaev
3. L.I. Sverzhevskiy Scientific Research Institute of Clinical Otorhinolaryngology