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Folia Medica 61(3): 358-369
doi:
10.3897/folmed.61.e39160
Received:
12 Nov 2017 | Approved:
28 Jan 2019 | Published:
30 Sep 2019
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Authors
Radostina V. Cherneva 
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Medical University, Sofia, Bulgaria
Medical University, Sofia, Bulgaria
Conflict of interest
The authors have declared that no competing interests exist.
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