Topolewska-Siedzik, Ewa http://orcid.org/0000-0001-8224-7469
Cieciuch, Jan
Article History
Received: 10 October 2017
Accepted: 2 February 2018
First Online: 1 March 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: The present study has been approved by the Commission on Ethics and Bioethics at Cardinal Stefan WyszyĆski University in Warsaw and has been performed in accordance with ethical standards.
: We obtained informed consent from parents of all participating adolescents in the study.