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Authors
Karalilova, R. https://orcid.org/0000-0001-8030-0529
Doykova, K. https://orcid.org/0000-0001-6433-7970
Batalov, Z. https://orcid.org/0000-0003-1233-5775
Doykov, D. https://orcid.org/0000-0002-7627-0651
Batalov, A. https://orcid.org/0000-0001-8857-0574
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Article History
Received: 9 November 2020
Accepted: 12 December 2020
First Online: 25 January 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest concerning this article.
: All study procedures were performed according to the ethical principles of the Declaration of Helsinki and Good Clinical Practice.
: Voluntarily signed informed consent was obtained from all participants before entering the study in accordance with the ethical recommendations of the Helsinki Declaration.
