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Folia Medica 61(4): 512-521
doi: 10.3897/folmed.61.e47745
Received: 04 Apr 2019 | Approved: 13 Jun 2019 | Published: 31 Dec 2019
This article is part of:
Folia Medica 61(4)
Authors
Yanitsa A. Zhelyazkova
Trakia University, Stara Zagora, Bulgaria
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Tanya T. Tacheva
Trakia University, Stara Zagora, Bulgaria
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Dimo M. Dimov
Trakia University, Stara Zagora, Bulgaria
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Denitsa G. Vlaykova
Trakia University, Stara Zagora, Bulgaria
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Aneliya V. Bivolarska
Medical University of Plovdiv, Plovdiv, Bulgaria
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Tatyana I. Vlaykova - Corresponding author
Trakia University, Stara Zagora, Bulgaria
Medical University of Plovdiv, Plovdiv, Bulgaria
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Author contributions

ZY – investigation, resources, writing original draft preparation

TT – methodology, investigation, formal analysis, visualization, writing original draft preparation

DD – conceptualization, resources, data curation, funding acquisition.

VD - methodology, formal analysis, visualization

VT – conceptualization, visualization, writing – review and editing, supervision, project administration, funding acquisition.


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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