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Folia Medica 62(1): 7-16
doi: 10.3897/folmed.62.e47772
Received: 29 Oct 2018 | Approved: 18 Jul 2019 | Published: 31 Mar 2020
This article is part of:
Folia Medica 62(1)
Authors
   
Tanya L. Sapundzhieva - Corresponding author
Medical University of Plovdiv, Plovdiv, Bulgaria
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Rositsa Karalilova
Medical University of Plovdiv, Plovdiv, Bulgaria
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Anastas Batalov
Medical University of Plovdiv, Plovdiv, Bulgaria
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Author's contribution

Dr Tanya Sapundzhieva – Substantial contributions to the conception and design of the work; the acquisition, analysis, and interpretation of data for the work; drafting the work, revising it critically for important intellectual content; final approval of the version to be published; agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Dr Rositsa Karalilova – Substantial contributions to the acquisition, analysis and interpretation of data for the work; revising the work critically for important intellectual content; final approval of the version to be published; agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Prof. Dr. Anastas Batalov – Substantial contributions to the conception and design of the work; and interpretation of data for the work; revising the work critically for important intellectual content; final approval of the version to be published; agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.


Conflict of interest
The authors have declared that no competing interests exist.
Supporting agencies
None
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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