Kazan medical journalKazan medical journal0368-48142587-9359Eco-Vector5861710.17816/kazmj58617MiscellaneousLetters to the editor131019302610106110611901202119012021Copyright © 2021, Board E.2021<p><span class="VIiyi" lang="en"><span class="JLqJ4b ChMk0b" data-language-for-alternatives="en" data-language-to-translate-into="ru" data-phrase-index="0">Letters to the editor</span></span></p>Kazan Medical archiveКазанский медицинский архив