Sokolov, M. http://orcid.org/0000-0002-2608-333X
Petrov, B.
Maslyankov, S.
Angelov, K.
Atanasova, M. P.
Tzoneva, D.
Gribnev, P.
Article History
Received: 13 May 2020
Accepted: 28 March 2021
First Online: 19 April 2021
Declarations
:
: The participants in the team of this study declare that they do not have any financial obligations or benefits from conducting and the consequences of this study. Drs. Manol Bonev Sokolov, Boril Petrov, Svilen Maslyankov, Kostadin Angelov, Margarita Atanasova, Dochka Tzoneva and Petar Gribnev have no conflicts of interest or financial ties to disclose.