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Article History

Received: 12 September 2019

Revised: 3 December 2019

Accepted: 20 March 2020

First Online: 26 October 2020

COMPLIANCE WITH ETHICAL STANDARDS

: <i>Conflict of interests</i>. The authors declare no apparent and potential conflicts of interest related to the publication of this article.

: <i>Statement of compliance with standards of research involving humans as subjects</i>. All studies were conducted in accordance with the principles of biomedical ethics formulated in the Helsinki Declaration of 1964 and its subsequent amendments, and approved by the local bioethical committee of the Crimean Federal University named after Far Eastern Branch, Russian Academy of Sciences, Vernadsky (Simferopol). Each study participant submitted voluntary written informed consent, signed by him after explaining to him the potential risks and benefits, as well as the nature of the forthcoming study.