Toneva, Diana http://orcid.org/0000-0001-7424-9704
Nikolova, Silviya http://orcid.org/0000-0001-5001-0707
Agre, Gennady http://orcid.org/0000-0003-4610-7973
Zlatareva, Dora http://orcid.org/0000-0001-5298-2278
Hadjidekov, Vassil
Lazarov, Nikolai http://orcid.org/0000-0003-3420-4346
Funding for this research was provided by:
Bulgarian National Science Fund (DN01/15-20.12.2016)
Bulgarian National Science Fund (DN11/9-15.12.2017)
Article History
Received: 12 August 2020
Accepted: 5 November 2020
First Online: 11 November 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Human Research Ethics Committee at the Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences.