Kruchinin, P. A.
Article History
Received: 1 July 2019
Revised: 19 July 2019
Accepted: 24 July 2019
First Online: 16 December 2019
COMPLIANCE WITH ETHICAL STANDARDS
: <i>Conflict of interests.</i> The author declares that he has no conflict of interest.
: <i>Statement of compliance with standards of research involving humans as subjects.</i> All procedures performed in studies involving human participants were in accordance with the ethical standards of the 1964 Helsinki Declaration and its later amendments. Informed consent was voluntarily provided by all individual participants involved in the study.