Received: 24 January 2022
Accepted: 8 June 2022
First Online: 23 June 2022
: The study was conducted in accordance with principles for human experimentation, as defined in the Declaration of Helsinki, local Good Clinical Practice guidelines and local Medical University Pleven institution guidelines. Written informed consent was obtained from all patients available at corresponding author on request.
: Not applicable.
: The authors have no conflicts of interest to declare.