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Bulgarian Cardiology 26(4): 5-11
doi:
10.3897/bgcardio.26.e55814
Published:
30 Dec 2020
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Authors

Petar Kalaydzhiev
- Corresponding author
Cardiology Clinic, UMHAT “Tsaritsa Yoanna” – ISUL, Medical University, Sofia, Bulgaria
Cardiology Clinic, UMHAT “Tsaritsa Yoanna” – ISUL, Medical University, Sofia, Bulgaria

Cardiology Clinic, UMHAT “Tsaritsa Yoanna” – ISUL, Medical University, Sofia, Bulgaria
Cardiology Clinic, UMHAT “Tsaritsa Yoanna” – ISUL, Medical University, Sofia, Bulgaria
Academic editor
UMHAT Sveta Marina, Varna, 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.