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Article History

Received: 28 January 2018

Accepted: 21 June 2018

First Online: 6 August 2018

Authors’ information

: Prof. Vladimir Kozlov is the Head of the Department of Otolaryngology at Central state medical academy of Department of Presidential affairs, Moscow, Russia.Prof. Galina Lavrenova is the Head of the Department of Otolaryngology at The first Pavlov State medical university of Saint Peterburg, Russia.Dr. Elena Savlevich associated professor of the ENT department of Otolaryngology at Central state medical academy of Department of Presidential affairs, Moscow, Russia.Kira Bazarkina is a postgraduate student at ENT department of Otolaryngology at Central state medical academy of Department of Presidential affairs, Moscow, Russia.

: Not applicable.

: All authors read and approved the final manuscript.

: The authors declare that they have no competing interests.

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