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Bulgarian Cardiology 27(1): 7-11
doi:
10.3897/bgcardio.27.e66863
Published:
07 Apr 2021
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Author
Bogdan Petrunov 
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Bulgarian Academy of Science, Sofia, 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.