Received: 13 November 2021
Accepted: 31 December 2021
First Online: 20 January 2022
: The study design and protocol were conducted following the Declaration of Helsinki, previously approved by the Ethics Committee of the University Hospital “St. Ivan Rilski” (Ethics Approval Protocol Number 02/15.02.2021). No sensitivity data were collected in our study.
: All subjects signed informed consent for inclusion in the study.
Free to read: This content has been made available to all.