Balashova, N. V.
Article History
Received: 23 May 2019
Revised: 14 June 2019
Accepted: 19 June 2019
First Online: 9 September 2020
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.