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Folia Medica 62(1): 23-30
doi:
10.3897/folmed.62.e47740
Received:
15 May 2019 | Approved:
18 Jul 2019 | Published:
31 Mar 2020
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Authors
Military Medical Academy, Sofia, Bulgaria
Georgi I. Popivanov 
- Corresponding author
- Corresponding author
Military Medical Academy, Sofia, Bulgaria
St Ivan Rilski University Hospital, Medical University, Sofia, Bulgaria
Military Medical Academy, Sofia, Bulgaria
Military Medical Academy, Sofia, Bulgaria
University of Perugia, Perugia, Italy
St Ivan Rilski University Hospital, Medical University, Sofia, Bulgaria
Military Medical Academy, Sofia, Bulgaria
Military Medical Academy, Sofia, Bulgaria
Medical University, Sofia, Bulgaria
Military Medical Academy, Sofia, 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.
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