Funding for this research was provided by:
Uniwersytet Medyczny w Lublinie (grant #DS 204)
Text and Data Mining valid from 2019-04-29
Received: 5 August 2018
Accepted: 31 March 2019
First Online: 29 April 2019
Ethics approval and consent to participate
: Medical University of Lublin Ethical Committee approved the study design (KE-0254/201/2008). Written, informed consent was obtained from each participant before entering the study.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.