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Folia Medica 63(6): 839-846
doi:
10.3897/folmed.63.e68216
Received:
03 May 2021 | Approved:
18 Aug 2021 | Published:
31 Dec 2021
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Authors
Gabriela A. Raycheva 
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Faculty of Medicine, Medical University Plovdiv, Plovdiv, Bulgaria
Faculty of Medicine,Medical University Plovdiv, Plovdiv, Bulgaria
Faculty of Medicine, Medical University of Plovdiv, Bulgaria, Plovdiv, Bulgaria
Conflict of interest
The authors have 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.