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Bulgarian Cardiology 27(2): 72-77
doi:
10.3897/bgcardio.27.e67905
Published:
21 Jul 2021
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Authors
Zhenya Marinova
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Medical University of Varna, Varna, Bulgaria
UMBAL Sv. Marina, Varna, Bulgaria
Medical University of Varna, Varna, Bulgaria
UMBAL Sv. Marina, Varna, Bulgaria
Medical University of Varna, Varna, Bulgaria
UMBAL Sv. Marina, Varna, Bulgaria
Medical University of Varna, Varna, Bulgaria
Academic editor

UHAT Sv. Ekaterina, Sofia, 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.