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Authors
Stoyanov, George S. https://orcid.org/0000-0002-6950-0615
Dzhenkov, Deyan
Petkova, Lilyana
Velkova, Deyana
Sapundzhiev, Nikolay
Ghenev, Peter
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Article History
Received: 2 July 2021
Accepted: 14 October 2021
First Online: 24 November 2021
Declarations
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: G.S. Stoyanov, D. Dzhenkov, L. Petkova, D. Velkova, N. Sapundzhiev and P. Ghenev declare that they have no competing interests.
: For this article no studies with human participants or animals were performed by any of the authors. All studies performed were in accordance with the ethical standards indicated in each case. Ethics approval: not applicable. Consent to participate: not applicable. Consent for publication: not applicable.
