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Authors
Fedotchev, A. I.
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Article History
Received: 7 December 2018
Revised: 7 December 2018
Accepted: 20 December 2018
First Online: 25 June 2019
COMPLIANCE WITH ETHICAL STANDARDS
: Conflict of interests. The authors declare that they have no conflict of interest.
: Statement of compliance with standards of research involving humans as subjects. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants involved in the study.
