Litvinov, I. S.
Dolgich, D. A.
Article History
Received: 23 August 2018
Revised: 19 October 2018
Accepted: 25 October 2018
First Online: 5 June 2019
COMPLIANCE WITH ETHICAL STANDARDS
: <i>Conflict of interests</i>. The authors declare that they have 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 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.