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Folia Medica 63(5): 647-656
doi:
10.3897/folmed.63.e67296
Received:
14 Apr 2021 | Approved:
22 Jun 2021 | Published:
31 Oct 2021
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Authors
Petar Dimov 
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Medical University of Plovdiv, Plovdiv, Bulgaria
Umeå University, Luleå, Sweden
National and Kapodistrian University of Athens, Athens, Greece
National and Kapodistrian University of Athens, Athens, Greece
Medical University of Plovdiv, Plovdiv, Bulgaria
Umeå University, Luleå, Sweden
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.