Funding for this research was provided by:
Medical University of Plovdiv (Internal university project)
Received: 20 March 2021
Accepted: 7 September 2021
First Online: 18 September 2021
: The authors declare that they have no conflicts of interest.
: The study was approved by the local Research Ethics Committee at the Medical University of Plovdiv.
: Informed consent was obtained from all individual participants included in the study.
: The participants have consented to the publication of the study results.