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Authors
Grozdev, Konstantin http://orcid.org/0000-0003-2016-1111
Khayat, Nabil
Shumarova, Svetlana
Ivanova, Gergana
Angelov, Kostadin
Todorov, Georgi
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Article History
Received: 15 April 2019
Accepted: 4 March 2020
First Online: 11 March 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: 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.
: For this type of study (retrospective analysis), formal consent is not required. The study was approved by the Institutional Review Board of Alexandrovska University Hospital, Sofia.
