Ivanova, Mariana http://orcid.org/0000-0002-0441-3043
Manolova, Irena http://orcid.org/0000-0002-4905-6537
Stoilov, Rumen http://orcid.org/0000-0002-6340-9650
Stanilova, Spaska http://orcid.org/0000-0003-1368-9081
Article History
Received: 22 June 2021
Accepted: 27 August 2021
First Online: 4 September 2021
Declarations
:
: Author Mariana Ivanova declares that she has no conflict of interest. Author Irena Manolova declares that she has no conflict of interest. Author Rumen Stoilov declares that he has no conflict of interest. Author Spaska Stanilova declares that she has no conflict of interest.