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Folia Medica 61(4): 540-544
doi: 10.3897/folmed.61.e47957
Received: 07 Nov 2018 | Approved: 06 Jun 2019 | Published: 31 Dec 2019
This article is part of:
Folia Medica 61(4)
Authors
Roman E. Tashev - Corresponding author
Medical University of Sofia, Sofia, Bulgaria
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Galya Tz. Stavreva
Medical University - Pleven, Pleven, Bulgaria
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Margarita St. Velikova
Medical University - Varna, Varna, 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 CC0 Public Domain Dedication.
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