Ibragimova, M. I.
Chushnikov, A. Y.
Cherepnev, G. V.
Yu Petukhov, V.
Article History
First Online: 20 December 2018
Compliance with Ethical Standards
: The written informed consent was obtained from each participant. The study was approved by the Kazan (Volga Region) Federal University ethics committee.
: The authors declare that they have no conflict of interest.