Funding for this research was provided by:
Ministerstwo Nauki i Szkolnictwa Wyższego (N N305 151537)
Text and Data Mining valid from 2018-12-28
Received: 3 October 2018
Accepted: 20 December 2018
First Online: 28 December 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.