Georgiev, Tsvetoslav http://orcid.org/0000-0002-1652-4648
Article History
Received: 4 July 2020
Accepted: 8 August 2020
First Online: 16 August 2020
Compliance with ethical standards
:
: The author declares that there is no conflict of interest regarding the publication of this article.
: This article does not contain any studies with human participants or animals performed by the author.