Funding for this research was provided by:
Russian Science Foundation (14-14-00284)
Article History
Received: 5 November 2018
Revised: 31 March 2019
Accepted: 3 April 2019
First Online: 8 April 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All applicable international, national, and institutional guidelines for the care and use of animals were followed. All procedures performed in the study were in accordance with the ethical standards of the St. Petersburg State University ethical committee (Permit No. 131-03-4).
: Informed consent is not applicable to the study since no human subjects were included in the study.