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Folia Medica 61(4): 559-565
doi:
10.3897/folmed.61.e47941
Received:
05 Dec 2018 | Approved:
09 Apr 2019 | Published:
31 Dec 2019
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Authors
Raina T. Gergova 
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Medical University of Sofia, Sofia, Bulgaria
Medical University of Sofia, Sofia, Bulgaria
Medical University of Sofia, 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 CC0 Public Domain Dedication.
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