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Folia Medica 62(4): 679-689
doi:
10.3897/folmed.62.e50517
Received:
27 Jan 2020 | Approved:
17 Mar 2020 | Published:
31 Dec 2020
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Author
Raisa Strebkova 
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Trakia University, Stara Zagora, Bulgaria
Conflict of interest
The author has declared that no competing interests exist.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.