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Folia Medica 62(4): 662-667
https://doi.org/10.3897/folmed.62.e50204. (31 Dec 2020)
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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
This article is part of:
Folia Medica 62(4)
Authors
Violeta Snegarova - Corresponding author
Department of Hygiene and Epidemiology,Medical University of Varna, Varna, Bulgaria
Articles by this author in:  CrossRef  |  PubMed  |  Google Scholar
Darina Naydenova
Department of Hygiene and Epidemiology,Medical University of Varna , Varna, Bulgaria
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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.
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