Funding for this research was provided by:
Ministry of Education of the Russian Federation (115080740020)
Article History
Received: 29 April 2019
Revised: 5 August 2019
Accepted: 13 August 2019
First Online: 30 August 2019
Compliance with Ethical Standards
:
: The authors declare no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: This article does not contain any studies with human participants, so no informed consent was necessary for this study.