Tomova, Vesela D.
Alexandrova, Margarita L.
Atanasova, Milena A.
Tzekova, Maria L.
Rashev, Tihomir R.
Ahmad, Sarfraz http://orcid.org/0000-0002-5180-0409
Funding for this research was provided by:
Medical University - Pleven, Pleven, Bulgaria (6/2015)
Article History
Received: 24 December 2019
Accepted: 14 June 2020
First Online: 23 June 2020
Compliance with ethical standards
:
: None of the authors has any potential financial or commercial conflict of interest associated with this research manuscript.
: This study was approved by the Research Ethics Commission of Medical University—Pleven, Bulgaria.
: Informed consent was obtained from all individual participants included in the study.