The authors declare that they have no conflict of interest.

The study was carried out in accordance with the World Medical Association Declaration of Helsinki (Helsinki, 2000). Informed consent was obtained from the legal representatives of the patients to participate in the study. The study design, its novelty, acceptability and acceptability were approved at a meeting of the Local Ethics Committee of the Ural State Medical University on December 16, 2018 (Protocol no. 10).