Text and Data Mining valid from 2020-02-15
Received: 20 May 2019
Accepted: 4 February 2020
First Online: 15 February 2020
Ethics approval and consent to participate
: The study was approved by the Bioethics Committee at the Swietokrzyska Chamber of Physicians. Signed informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.