Gunin, A. G.
Golubtzova, N. N.
Kornilova, N. K.
Article History
Received: 24 May 2019
Revised: 22 July 2019
Accepted: 26 July 2019
First Online: 9 December 2020
COMPLIANCE WITH ETHICAL STANDARDS
: <i>Conflicts of interest</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 ethical committee of the Medical Faculty of the Ulyanov Chuvash State University.