Funding for this research was provided by:
Polish Ministry for Science and Higher Education (PBZ-MEiN-9/2/2006 and K143/P01/2007/1)
Text and Data Mining valid from 2020-03-14
Received: 30 September 2019
Accepted: 27 February 2020
First Online: 14 March 2020
Ethics approval and consent to participate
: All participants gave a written informed consent for participation in the study. The study was approved by the Bioethics Commission of the Medical University of Silesia in Katowice.
: Not applicable.
: There are no conflicts of interest to declare.