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Bulgarian Cardiology 26(1): 44-52
doi:
10.3897/bgcardio.26.e52193
Published:
05 Jun 2020
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Authors
Anna Zagorska 
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Acibadem City Clinic, Sofia, Bulgaria, Sofia, Bulgaria
University Multiprofile Hospital for Active Treatment "Saint Ekaterina", Sofia, Bulgaria
Military Medical Academy, Sofia, Bulgaria
National Cardiology Hospital, Sofia, Bulgaria
University Multiprofile Hospital for Active Treatment "Aleksandrovska", Sofia, Bulgaria
Medical University – Pleven, Pleven, Bulgaria
National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria
Acibadem City Clinic Tokuda Hospital, Sofia, Bulgaria
National Cardiology Hospital, Sofia, Bulgaria
National Cardiology Hospital, Sofia, Bulgaria
National Cardiology Hospital, Sofia, Bulgaria
Acibadem City Clinic, Tokuda Hospital, Sofia, Bulgaria
University Multiprofile Hospital for Active Treatment "Saint Anna", Sofia, Bulgaria
Military Medical Academy, Sofia, Bulgaria
Acibadem City Clinic, Sofia, Bulgaria
Multiprofile Regional Hospital for Active Treatment "Dr. Stefan Cherkezov", Veliko Tarnovo, Bulgaria
UMHAT Alexandrovska, Sofia, Bulgaria
University Multiprofi le Hospital for Active Treatment „Aleksandrovska“, Sofia, Bulgaria
Academic editor
National Transport Hospital, Sofia, Bulgaria
Conflict of interest
The authors have declared that no competing interests exist.
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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.