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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.
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