Author contribution: Volkova AS — analysis of the research data, review of publications on the topic of the article, summary, manuscript writing; Ilyin MV — developing the article design, statistical analysis, manuscript editing; Kagramanyan IN — consultations on the issues related to the study, literary editing of the article, scientific editing of the article; Khokhlov AL — consultations on the issues related to the study, literary editing, scientific editing of the article.

Compliance with ethical standards: the study was approved by the Ethics Committee of the Yaroslavl State Medical University. The informed consent was submitted by all subjects. The survey of adults was performed on a voluntary basis.