Funding for this research was provided by:
Ministerstwo Nauki i Szkolnictwa Wyższego (SRZ-08)
Text and Data Mining valid from 2019-11-28
Received: 1 July 2019
Accepted: 1 November 2019
First Online: 28 November 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.