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Folia Medica 61(3): 352-357
doi: 10.3897/folmed.61.e39120
Received: 19 Oct 2018 | Approved: 23 Jan 2019 | Published: 30 Sep 2019
This article is part of:
Folia Medica 61(3)
Authors
Danail B. Petrov
Clinical Center for Pulmonary Diseases, Medical University, Sofia, Bulgaria
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Dragan Subotic
Clinical Center of Serbia, Belgrade, Serbia
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Georgi S. Yankov
Clinical Center for Pulmonary Diseases, Medical University, Sofia, Bulgaria
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Dinko G. Valev
Clinical Center for Pulmonary Diseases, Medical University, Sofia, Bulgaria
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Evgeni V. Mekov - Corresponding author
St Sofia University Hospital, Medical University, Sofia, Bulgaria
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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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