Vasilev, Georgi http://orcid.org/0000-0002-6314-6889
Manolova, Irena http://orcid.org/0000-0002-4905-6537
Ivanova, Mariana http://orcid.org/0000-0002-0441-3043
Stanilov, Iskren
Miteva, Lyuba http://orcid.org/0000-0002-0028-7692
Stanilova, Spaska http://orcid.org/0000-0003-1368-9081
Funding for this research was provided by:
Fund for Scientific and Mobile project from Faculty of Medicine at the Trakia University, Stara Zagora, Bulgaria (1/2016)
Article History
Received: 8 May 2021
Accepted: 16 July 2021
First Online: 28 July 2021
Competing interests
: The authors declare no competing interests.