Miteva, Lyuba D. http://orcid.org/0000-0002-0028-7692
Manolova, Irena M. http://orcid.org/0000-0002-4905-6537
Ivanova, Mariana G. http://orcid.org/0000-0002-0441-3043
Stoilov, Rumen M. http://orcid.org/0000-0002-6340-9650
Stanilova, Spaska A. http://orcid.org/0000-0003-1368-9081
Funding for this research was provided by:
Trakia University, Medical Faculty, Stara Zagora, Bulgaria (2/2017)
Trakia University, Medical Faculty, Stara Zagora (2/2018)
Article History
Received: 15 November 2019
Accepted: 27 February 2020
First Online: 9 March 2020
Compliance with ethical standards
:
: Miteva L, Manolova I, Ivanova M, Stoilov R and Stanilova S declare that they have no conflict of interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the local Ethics Committee of the University Hospital “St. Ivan Rilski”, Sofia, Bulgaria with a decision number #6, 29 Nov 2016.
: Informed consent was obtained from all individual participants involved in the study.