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Authors
Savostin, A. A.
Ritter, D. V.
Savostina, G. V.
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Article History
Received: 15 February 2019
Revised: 1 May 2019
Accepted: 15 July 2019
First Online: 27 December 2019
COMPLIANCE WITH ETHICAL STANDARDS
: <i>Conflict of interest.</i> The authors declare that they have no conflict of interest.
: The present article describes no studies in which humans would participate as subjects. All the data used in the work were obtained from publicly available sources.
