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Article History

Received: 2 February 2021

Revised: 9 March 2021

Accepted: 23 March 2021

First Online: 28 August 2021

COMPLIANCE WITH ETHICAL STANDARDS

: All studies were performed in the correspondence with the principles of biomedical ethics adopted by the 1964 Helsinki Declaration and its subsequent revisions and approved by the Commission for Biomedical Ethics of the Institute of Biomedical Problems of the Russian Academy of Sciences (Moscow).

: The authors declare the absence of obvious or potential conflicts of interest associated with the publication of this article.

: Each participant gave his voluntary informed consent signed after informing him about potential risks, as well as about the nature of the forthcoming study.