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Authors
Antonova, Borislava
Naydenov, Emanuil
Koynova, Rumiana
Tumangelova-Yuzeir, Kalina
Tenchov, Boris https://orcid.org/0000-0002-2065-9086
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Funding
Funding for this research was provided by:
Bulgarian National Science Fund (DN03/13/2016)
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Article History
Received: 10 January 2020
Revised: 18 February 2020
Accepted: 1 March 2020
First Online: 14 March 2020
Compliance with ethical standards
:
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Research Ethics Committee of Medical University-Sofia (protocol reference No. 24/19.11.2015) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
