Funding for this research was provided by:
FP7 Co-operation Socio-economic Sciences and Humanities (244744)
First Online: 7 May 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.
: Author Roman Kuhar declares that he has no conflict of interest. Author Mojca Pajnik declares that she has no conflict of interest.