Dobrev, Hristo Petrov http://orcid.org/0000-0002-5513-3789
Abadjieva, Tsvetana Ivanova
Ivanova, Zlatina Georgieva
Aleksiev, Teodor Ivanov
Vutova, Nina Ivanova
Article History
Received: 22 August 2023
Accepted: 19 December 2023
First Online: 9 January 2024
Conflict of interest
: H.P. Dobrev, T.I. Abadjieva, Z.G. Ivanova, T.I. Aleksiev, and N.I. Vutova declare that they have no competing interests.