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Folia Medica 62(4): 662-667
doi:
10.3897/folmed.62.e50204.
Received:
16 Jan 2020 | Approved:
17 Mar 2020 | Published:
31 Dec 2020
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Authors
Violeta Snegarova 
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Department of Hygiene and Epidemiology,Medical University of Varna, Varna, Bulgaria
Department of Hygiene and Epidemiology,Medical University of Varna , Varna, 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.