Funding for this research was provided by:
National Science Center, Poland (2014/14/M/HS6/00919)
Text and Data Mining valid from 2018-03-19
First Online: 19 March 2018
Compliance with Ethical Standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.
: Radosław Rogoza declares that he has no conflict of interest. Jan Cieciuch declares that he has no conflict of interest.