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Bulgarian Cardiology 27(2): 60-64
doi:
10.3897/bgcardio.27.e70144
Published:
21 Jul 2021
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Author

Plamen Gatzov
- Corresponding author
Medical University - Pleven, Pleven, Bulgaria
Academic editor

UMHAT Sveti Georgi, Plovdiv, Bulgaria
Head of I Department of internaldiseases, Plovdiv,
Conflict of interest
The author has 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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