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Authors
Stoyanov, George S. https://orcid.org/0000-0002-6950-0615
Dzhenkov, Deyan
Petkova, Lilyana
Sapundzhiev, Nikolay
Georgiev, Svetoslav
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Article History
Received: 17 June 2020
Revised: 26 June 2020
Accepted: 17 July 2020
First Online: 25 July 2020
Compliance with Ethical Standards
:
: The authors declare that they have no competing interest.
: All procedures contributing to this work complied with the ethical standards of the Helsinki declaration of 1964 and its seventh revision from 2013, the ethical standards of the Bulgarian Ministry of Healthcare, as well as the ethical standards and protocols of the St. Marina University Hospital, Varna, Bulgaria.
