Georgieva, Ralitsa http://orcid.org/0000-0001-9732-050X
Gancheva, Maria
Ivanov, Georgi
Shipochka, Maria
Markov, Pavel
Nihtianova, Diana
Iordanova, Reni
Naydenov, Anton
Funding for this research was provided by:
European Regional Development Fund (BG05M2OP001-1.001-0008-C03)
Bulgarian National Science Fund (КP-06-Н49/4)
Article History
Received: 23 December 2020
Accepted: 28 January 2021
First Online: 9 February 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.