Article History
First Online: 30 September 2017
Compliance with Ethical Standards
:
: The first author of the study has received research grants from the Central European Exchange Program for University Studies (CEEPUS). The second and the third authors of the study declare that they have no conflict of interest.
: 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.