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Folia Medica 62(4): 690-694
doi:
10.3897/folmed.62.e51230
Received:
17 Feb 2020 | Approved:
23 Mar 2020 | Published:
31 Dec 2020
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Authors

Medical University of Sofia, Sofia, Bulgaria
Evgeni Mekov
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Medical University of Sofia, Sofia, Bulgaria
Medical University of Sofia, Sofia, Bulgaria
Conflict of interest
The authors have declared that no competing interests exist.
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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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