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Bulgarian Cardiology 27(2): 66-71
doi:
10.3897/bgcardio.27.e69610
Published:
21 Jul 2021
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Authors

Iskra Bayraktarova
- Corresponding author
National Heart Hospital, Sofia, Bulgaria
National Heart Hospital, Sofia, Bulgaria
Academic editor

UMHAT TSARITSA YOANNA-ISUL, София, 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.