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Authors
Stoyanov, Dragomir Svetozarov https://orcid.org/0000-0003-2064-9475
Conev, Nikolay Vladimirov
Donev, Ivan Shterev
Tonev, Ivan Dimitrov
Panayotova, Teodorika Vitalinova
Dimitrova-Gospodinova, Eleonora Georgieva
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Article History
Received: 15 December 2021
Accepted: 10 March 2022
First Online: 15 March 2022
Declarations
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: This study was performed in line with the principles of the Declaration of Helsinki. This study follows the approved ethical procedures of the local institutional review board.
: Not applicable.
: Not applicable.
: The authors declare no competing interests.
