Article History
First Online: 9 May 2018
Compliance with Ethical Standards
:
: All authors 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.
: A written informed consent was obtained for all participants (adolescents) by sending letters to their parents in order to inform them of the study. No parents objected to their child’s involvement in the study. We also obtained assent from all the adolescents involved in the study (these informations are include in the manuscript).