Sidelev, S. I.
Article History
Received: 3 December 2018
Revised: 21 December 2018
Accepted: 1 February 2019
First Online: 17 June 2019
COMPLIANCE WITH ETHICAL STANDARDS
: <i>Сonflict of interests.</i> The authors declare that they have no conflict of interest.
: <i>Statement on the welfare of animals.</i> This article does not contain any studies involving animals performed by any of the authors.