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Bulgarian Cardiology 27(2): 38-59
doi:
10.3897/bgcardio.27.e68450
Published:
21 Jul 2021
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Author
Yoto Yotov
- Corresponding author
University Hospital St Marina, Varna, Bulgaria
Medical University Prof Dr P Stoyanov, Varna, Bulgaria
Academic editor

Medical University Plovdiv, Plovdiv, Bulgaria
UMHAT SVETI GEORGI, Plovdiv, Bulgaria
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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