Gunin, A. G.
Golubtzova, N. N.
Article History
Received: 7 February 2019
Revised: 20 February 2019
Accepted: 28 February 2019
First Online: 18 February 2020
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>. The study was approved by the ethics committee of the medical faculty of Chuvash State University.